The mother of Lauren Spierer, an Indiana college student who vanished without a trace more than a year ago, told the person responsible in an open letter released Thursday that, "I hope with every breath you take, you remember Lauren."

In a letter addressed, "To Whom This May Concern," and published on the family's blog, Charlene Spierer said she has more questions than answers about her daughter's disappearance.

"Have we met? Time will tell. So many questions," she wrote. (Full Letter)

Lauren Spierer would be 21-years-old Friday. She was last seen around 4:30 a.m. June 3, 2011 just a few blocks from her Smallwood Plaza apartment in Bloomington. Earlier in the night, Spierer had visited Kilroy's, a nearby sports bar that closes at 3 a.m. When she left the establishment, she left behind her shoes and cellphone, police said.

After leaving the bar, Spierer reportedly went to fellow college student Corey Rossman's apartment before deciding to walk home. What happened to her after that remains a mystery. She was reported missing less than 12 hours later.

The Bloomington Police Department, Indiana University police, the Monroe County Sheriff's Department, Indiana State Police and the FBI have all searched for Spierer. But authorities say they do not know who is responsible for her disappearance.

PHOTOS: (Story Continues Below)

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  • Lauren Spierer

    Photo from the <a href="http://www.facebook.com/groups/VoicesForLauren/photos/" target="_hplink">Voices For Lauren Spierer</a> Facebook page. This group was created on July 7th, 2011 to help find the missing Indiana college student.

  • Missing Indiana Student

    Robert and Charlene Spierer talk about their missing daughter Lauren Spierer during a news conference in Bloomington, Ind., Friday, July 1, 2011. Spierer, 20, of Greenburgh, N.Y., was last seen early June 3 walking alone toward her apartment after a night of drinking with friends.(AP Photo/Michael Conroy)

  • Lauren Spierer

    Photo from the <a href="http://www.facebook.com/groups/VoicesForLauren/photos/" target="_hplink">Voices For Lauren Spierer</a> Facebook page. This group was created on July 7th, 2011 to help find the missing Indiana college student.

  • Lauren Spierer

    Photo from the <a href="http://www.facebook.com/Lauren.Spierer.Family.Updates" target="_hplink">Voices For Lauren</a> Facebook page. This group was created on July 7th, 2011 with a mission to help spread the words and contribute to the efforts to find Lauren Spierer.

  • Missing Indiana Student

    Robert Spierer struggles to talk about his missing daughter Lauren Spierer during a news conference in Bloomington, Ind., Friday, June 17, 2011. Spierer, 20, of Greenburgh, N.Y., was last seen early June 3 walking alone toward her apartment after a night of drinking with friends. (AP Photo/Michael Conroy)

  • Missing Indiana Student

    This photo distributed by the Bloomington Police Department, Wednesday, June 15, 2011, shows Lauren Spierer, taken by a video surveillance camera as she left her apartment building on the night she disappeared in Bloomington, Ind. Spierer, 20, of Greenburgh, N.Y., was last seen early June 3 walking alone toward her apartment after a night of partying with friends. (AP Photo/Bloomington Police Department)

  • Missing Indiana Student

    Robert and Charlene Spierer wait to talk about their missing daughter Lauren Spierer and Sunday being Father's Day during a press conference in Bloomington, Ind., Friday, June 17, 2011. Spierer, 20, of Greenburgh, N.Y., was last seen early June 3 walking alone toward her apartment after a night of drinking with friends. (AP Photo/Michael Conroy)

  • Lauren Spierer

    Photo from the <a href="http://www.facebook.com/groups/VoicesForLauren/photos/" target="_hplink">Voices For Lauren Spierer</a> Facebook page. This group was created on July 7th, 2011 to help find the missing Indiana college student.

  • Missing Indiana Student

    Robert Spierer displays a photo of his missing daughter Lauren Spierer taken by a video surveillance camera in her apartment building on the night she disappeared during a press conference in Bloomington, Ind., Wednesday, June 15, 2011. Spierer, 20, of Greenburgh, N.Y., was last seen early June 3 walking alone toward her apartment after a night of drinking with friends. (AP Photo/Michael Conroy)

  • Missing Indiana Student

    Charlene Spierer displays a photo of her missing daughter Lauren Spierer taken by a video surveillance camera in her apartment building on the night she disappeared during a press conference in Bloomington, Ind., Thursday, June 16, 2011. Spierer, 20, of Greenburgh, N.Y., was last seen early June 3 walking alone toward her apartment after a night of drinking with friends. (AP Photo/Michael Conroy)

  • Missing Indiana Student

    Indiana basketball coach Tom Crean, right, talks with Charlene Spierer, mother of missing Indiana University student Lauren Spierer, 20, as volunteers gathered to continue to search for her in Bloomington, Ind., Wednesday, June 8, 2011. Spierer disappeared Friday about 4:30am. Police say they suspect foul play in the disappearance of the Indiana University student five days ago, but have little information about what happened to her. (AP Photo/Michael Conroy)

  • Missing Indiana Student

    This aerial map and timeline distributed by the Bloomington Police Department, June 16, 2011, shows a locations and times where Lauren Spierer was last seen before she disappeared in Bloomington, Ind. Spierer, 20, of Greenburgh, N.Y., was last seen early June 3 walking alone toward her apartment after a night of drinking with friends. (AP Photo/Bloomington Police Department)

  • Missing Indiana Student

    Charlene Spierer waits to thank those helping for the search of their missing daughter during a press conference in Bloomington, Ind., Thursday, June 16, 2011. Lauren Spierer, 20, of Greenburgh, N.Y., was last seen early June 3 walking alone toward her apartment after a night of drinking with friends. (AP Photo/Michael Conroy)

  • Missing Indiana Student

    This photo distributed by the Bloomington Police Department, Wednesday, June 15, 2011, shows a vehicle captured by a video surveillance camera that came to the attention of investigators in the disappearance of Lauren Spierer in Bloomington, Ind. This camera is near the area where Spierer, 20, of Greenburgh, N.Y., was last seen early June 3 walking alone toward her apartment after a night of partying with friends. (AP Photo/Bloomington Police Department)

  • Missing Indiana Student

    This photo distributed by the Bloomington Police Department, Wednesday, June 15, 2011, shows a vehicle captured by a video surveillance camera that came to the attention of investigators in the disappearance of Lauren Spierer in Bloomington, Ind. This camera is near the area where Spierer, 20, of Greenburgh, N.Y., was last seen early June 3 walking alone toward her apartment after a night of partying with friends. (AP Photo/Bloomington Police Department)

  • Missing Indiana Student

    Dawn Adams fills out a sign up sheet on the back of Steve Scott as they joined the search for Lauren Spierer, 20, as volunteers gathered outside the girl's apartment building in Bloomington, Ind., Tuesday, June 7, 2011. Spierer was last seen at about 4:30 a.m. Friday walking alone toward her apartment in downtown Bloomington. Adams is the mother of Wade Steffey, the Purdue student who went missing and was later found dead in 2007. (AP Photo/Michael Conroy)

  • Missing Indiana Student

    A missing person poster of Lauren Spierer, 20, is posted on one of the entry gates to Indiana University in Bloomington, Ind., Wednesday, June 8, 2011. Spierer disappeared around 4:30 am on Friday. Police say they suspect foul play in the disappearance of a 20-year-old Indiana University student, but have little information about what happened to her. (AP Photo/Michael Conroy)

  • Missing Indiana Student

    Kilroy's Sport Bar, with it's outdoor beach area, is shown in Bloomington, Ind., Wednesday, June 8, 2011. The bar, located just a block from the apartment, top right, of missing twenty-year-old Indiana University student Lauren Spierer. Spierer was drinking with friends, last Thursday, police say, left her shoes and cell phone at a bar and was last seen walking home alone from a friend's apartment at 4:30 a.m. (AP Photo/Michael Conroy)

  • Missing Indiana Student

    A volunteer reaches for a flyer as they continue to search for Lauren Spierer, 20, in Bloomington, Ind., Wednesday, June 8, 2011. Spierer disappeared Friday about 4:30am. Police say they suspect foul play in the disappearance of the Indiana University student five days ago, but have little information about what happened to her. (AP Photo/Michael Conroy)

  • Missing Indiana Student

    A missing person poster of Lauren Spierer, 20, is posted on a sign post outside her apartment building in Bloomington, Ind., Tuesday, June 7, 2011. Spierer disappeared around 4:20 a.m. on Friday. Police say they suspect foul play in the disappearance of a 20-year-old Indiana University student five days ago, but have little information about what happened to her. (AP Photo/Michael Conroy)

  • Missing Indiana Student

    Bicyclists, walkers and cars make their way along Kirkwood Ave. as it boarders Indiana University in Bloomington, Ind., Wednesday, June 8, 2011. Indiana University student Lauren Spierer, 20, disappeared around 4:30am on Friday. Police say they suspect foul play in the disappearance, but have little information about what happened to her. (AP Photo/Michael Conroy)

  • Friends of Missing College Student Lauren Spierer Share About Close Relationship

    Their friend has now been missing for days, and now Becca Lefkowitz and Blair Wallach are speaking out about what could have happened to Lauren Spierer. If you have any information on her whereabouts, Spierer's family and local authorities are asking people to contact (812)-339-4477.

  • Lauren Spierer's dad pleads for help in the search

    Robert Spierer pleaded for the public's help finding their daughter.

  • An exclusive sit-down interview with the family of Lauren Spierer.

    An exclusive sit-down interview with the family of Lauren Spierer. The 20 year old Edgemont native disappeared June 3rd. News 12 Dec 20, 2011

  • 11 Months Missing IU Student Lauren Spierer's Impact on Students' Behavior

    It has almost been one year since IU student Lauren Spierer went missing. Since that early morning last June, how have students' behavior and decision-making at night changed? Hoosier News Source's Lauren Linder has the story.

  • Illinois bones aren't missing IU student Lauren Spierer

    Bones found in Newton, Ill. are not those of missing Indiana University student Lauren Spierer.

  • Happy Birthday, Lauren Spierer!

    On January 17th Lauren Spierer who went missing on June 3rd turned 21 years old. This video was created by Jalen Faith with a purpose to provide support for the Spierer's on this particularly hard day. To Rob & Charlene (and family): We love you, and we're here for you! Copyright infringement not intended. Music rights to Brice Fox, and Daniel Weber. Pictures of Lauren Spierer rights to the Spierer family. Happy birthday pictures provided by LS supporters. Thank you!

  • Police seeking truck in Lauren Spierer case

    News Report from Lauren Spierer case.

  • Friend of Student Lauren Spierer Has No Memory of Night She Went Missing

    After the parents of missing Indiana college student Lauren Spierer hoped for tips to pour in from a national TV program's profile of their daughter's case over the weekend, police say they're still waiting for any such call. Former DC homicide investigator Rod Wheeler gave his professional insight on what theories police have so far, who the culprit might be in her disappearance, and whether Spierer's friend claiming memory loss may in some way be connected.

  • Newsy Now: June 17 (GMT 1500)

    Breaking: Pentagon Security Scare; Lauren Spierer Photos; Strauss-Kahn Claimed Immunity; Saudia Arabia Women Drivers; Rebecca Black Pulls Friday Vid.

  • Missing IU Student’S Friend: 'I Blacked Out'

    The search for missing Indiana University student Lauren Spierer continues as new clues emerge.

"Who are you? Did you go on any searches?" Charlene Spierer asks in her letter. "Maybe you were no longer in Bloomington as thousands helped look for Lauren. Did you use Lauren's disappearance to your advantage?"

Spierer wrote about the anxiety her family is experiencing as they wait for the identification of a skull that was found not far from where her daughter disappeared. "It could take as long as eight weeks. That's 80,640 minutes of agony," she explained.

Fishermen found the skull in the White River July 9 about 50 miles from Bloomington. Police divers searched the waterway for additional remains, but nothing was found.

A spokesperson for Bloomington police told The Huffington Post that the skull will be examined by a forensic anthropologist. The expert will work to determine the age, race, and gender, and whether the skull belongs to Spierer. The spokesperson confirmed the testing could take up to two months to complete.

There is, however, at least one person who already knows whether or not the skull could be Lauren Spierer's.

"I find it incomprehensible that if by chance you are reading this, you know the answer already," Charlene Spierer wrote. "I recently read that the White River is 362 miles long. I am guessing that if you placed Lauren in a body of water, the current could have relocated her to another area."

Authorities have not commented on whether there were any indications of external injuries to the skull.

This is also not the first time the Spierer family has waited for news on a potential match. In April, skeletal remains were found west of Bloomington, but experts ultimately determined the bones belonged to an unidentified male.

That month, Lauren Spierer's father, Robert Spierer, told the Journal News he is frustrated with the case and reached a conclusion about Rossman -- the student his daughter allegedly visited before she went missing.

"I think he's a liar and a coward," Robert Spierer told the Journal News.

Rossman's lawyer, Carl Salzmann, has said his client has no memory of his last moments with Spierer because he was punched in an altercation that evening.

Robert Spierer told the newspaper the memory loss claim was "laughable" and a "statement of convenience."

In her letter, Charlene Spierer mentions five men who hired attorneys after Lauren's disappearance, saying they have refused to cooperate with police and will not submit to polygraph tests.

"Five young men, five attorneys," she wrote. "I'm still not sure why they felt it was necessary. I know hiring an attorney is not an admission of guilt, however it leads me to believe there was something to hide ... I wonder if you are among those who continue to refuse to cooperate with the Bloomington Police Department. You can well imagine, a year later, those conducting the investigation have more questions which need to be answered. And yet those that could help refuse to do so."

Lauren's family members created and maintain a website called findlauren.com. They are offering a $250,000 reward for information that leads to finding their daughter.

"You may or may not be a parent," Charlene Spierer wrote. "Somehow I doubt that you are a parent. I guarantee you have no idea what it's like, waiting to find out if the remains recovered from any number of places are those of your child. I hope I am making you uncomfortable. I hope you have as many sleepless nights as I have. I hope that someday, your parents, your siblings, your friends will all be in a courtroom when your true self is revealed, the self which was born on June 3, 2011 when you took Lauren from us."

Lauren Spierer is described as a white female who is 4-feet-11-inches with a slender build, blue eyes and blond hair. She was last wearing a white tank top with a light-colored shirt over it and black stretch pants. Anyone with information on her whereabouts is asked to call Bloomington Police at 812-339-4477.

The complete text of Charlene Spierer's letter follows:

To Whom This May Concern:

It sickens me to write to you once again, but I have no choice. Time continues to pass and I cannot let you forget about Lauren. Rebecca recently said she holds close those people who knew Lauren. I realized in that moment that our lives will be forever defined as the time before Lauren disappeared and the time after. Another thing you and I share, the before and the after. For me, living without Lauren, it's the little things in my day-to-day life which are the most difficult. The things that aren't mentioned. Getting mail addressed to Lauren, walking past her room just as she left it the last time she was home, still waiting for her return. The unpacked boxes I cannot bear to move. The notice Rob has hidden away among so many other pieces of mail, from the Department of Motor Vehicles. It's Lauren's. It arrived shortly before her 21st birthday. We try to shield each other from more pain. It is impossible to do.

On June 4, 2011, we were hoping for Lauren's rescue. That’s what the Bloomington Police Department was hoping for as well. As time passed, we were hoping for Lauren's recovery. Today we are waiting to find out if the remains found in the White River belong to Lauren. We wait along with other families of missing loved ones. It could take as long as eight weeks. That's 80,640 minutes of agony. We are waiting to find out if a skull found in the White River might be Lauren's. It's chilling to say the words. I find it incomprehensible that if by chance you are reading this, you know the answer already. I recently read that the White River is 362 miles long. I am guessing that if you placed Lauren in a body of water, the current could have relocated her to another area. I can't say that I have read anything about decomposition or what might happen to a body that has been in water for over a year. Though this past year has taught me things I never would have expected to learn, decomposition is one area I refuse to explore. Lauren's DNA and dental records are on file with CODIS. "CODIS is the acronym for the "Combined DNA Index System" and is the generic term used to describe the FBI's program of support for criminal justice DNA databases as well as the software used to run those databases. The National DNA Index System or NDIS is considered one part of CODIS, the national level, containing the DNA profiles contributed by federal, state, and local participating forensic laboratories." We continue to wait for the results from the Marion County coroner's office.

You may or may not be a parent. Somehow I doubt that you are a parent. I guarantee you have no idea what it’s like, waiting to find out if the remains recovered from any number of places are those of your child. I hope I am making you uncomfortable. I hope you have as many sleepless nights as I have. I hope that some day, your parents, your siblings, your friends will all be in a courtroom when your true self is revealed, the self which was born on June 3, 2011 when you took Lauren from us.

We were shocked when several people hired attorneys within days of Lauren's disappearance. Five young men, five attorneys. I'm still not sure why they felt it was necessary. I know hiring an attorney is not an admission of guilt, however it leads me to believe there was something to hide. Questions remain unanswered and law enforcement polygraphs remain untaken. We are still without Lauren. Did you hire an attorney? I wonder if you are among those who continue to refuse to cooperate with the Bloomington Police Department. You can well imagine, a year later, those conducting the investigation have more questions which need to be answered. And yet those that could help, refuse to do so. Who are you? Did you go on any searches? Maybe you were no longer in Bloomington as thousands helped look for Lauren. Did you use Lauren's disappearance to your advantage? Have we met? Time will tell. So many questions. I will never forgive those who could have helped and did not. Though I doubt my sentiments matter to you, I will never forget you for as long as I live. I hope that every time you look into a mirror you remember the choices you made on June 3, 2011. I hope with every breath you take, you remember Lauren.

We are grateful to all those who continue to make sure Lauren's tragic story stays alive. There are many who stand beside us in our quest for answers. No matter what happened on June 3, 2011, the fact that Lauren seemingly vanished into thin air is undeniable and for that you are responsible. I trust that Lauren will have her day and justice will be served. Until that time, we remain steadfast in our search for answers which will lead us to Lauren.

Charlene Spierer

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  • Donald Cavanaugh

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  • Jason Ellis

    Jason Ellis, of Indianapolis, has been missing since Dec. 3, 2006. According to <a href="http://projectjason.org/forums/topic/1733-missing-man-jason-ellis-in-1242006/" target="_hplink">Project Jason</a>, Ellis disappeared from an apartment he shared with two roommates. One of the roommates allegedly told police that Ellis, then 20, had left and taken his belongings with him. However, Ellis' last two paychecks were untouched and his car was still parked at the residence. In 2010, authorities told local media that they suspect Ellis is the victim of a homicide, but investigators did not elaborate. At the time of his disappearance, Ellis was 160 pounds and 6 feet 1 inch tall. He had a tattoo of his mother's name, Neatrice, on his chest, tattoos of Scooby and Scrappy Doo on his left arm, and a tattoo of a maple leaf and his name on his right arm. Anyone with information regarding Ellis' disappearance is asked to call the Indianapolis Police Department at (317) 413-7440.

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  • Lauren Spierer

    Lauren Spierer, 20, was last seen around 4:30 a.m. on June 3, 2011, just a few blocks from her apartment in Bloomington, Ind. Earlier in the night, Spierer had visited Kilroy's, a nearby sports bar that closes at 3 a.m. When she left the establishment, she left behind her shoes and cell phone, police said. After leaving the bar, Spierer reportedly went to the apartment of Corey Rossman, a fellow college student at the university, before deciding to walk home. What happened to her after that remains a mystery. She was reported missing less than 12 hours later. Bloomington police, Indiana University police, the Monroe County Sheriff's Office, Indiana State Police and the FBI have all conducted searches for Spierer. Lauren Spierer is described as a white female, 4 feet 11 inches tall with a slender build. She has blue eyes and blond hair. She was last seen wearing a white tank top with a light-colored shirt over it and black stretch pants. Anyone with information on her whereabouts is asked to call Bloomington Police at 812-339-4477.

  • Vilet Torrez

    Vilet Patricia Torrez, 38, of Miramar, Fla., was last seen by a friend she met for dinner on the night of March 30, 2012. Authorities have declined to comment on where Torrez went for dinner and will not release the name of the person she was with. Torrez's movements after the dinner are also unknown, but the vehicle she was driving was later found at her residence in the 12900 block of Southwest 28th Court, a gated community off Miramar Parkway. Torrez was scheduled to work March 31 at her job with Bath Fitter in Doral, but she did not show up or call in. On April 2, Torrez was reported missing. Her estranged husband, Cid Torrez, has since been named a person of interest in her disappearance. Torrez is 5 feet 3 inches, weighs 125 to 130 pounds, and has black hair and brown eyes. Anyone with information about her disappearance is asked to call Miramar police at (954) 602-4000 or Broward Crime Stoppers at (954) 493-TIPS.

  • Michelle Parker

    Michelle Parker, 33, vanished on Nov. 17, 2011, the same day that her appearance with her ex-fiance, Dale Smith, aired on "The People's Court." The couple was in dispute over a $5,000 engagement ring. After hearing both sides, Judge Marilyn Milian ordered Parker to pay Smith $2,500. A few hours after the episode aired, Parker dropped her 3-year-old twins off at Smith's condo for scheduled visitation. Parker's 2008 black Hummer H3 was found the following day in a parking lot on the west side of Orlando. Decals for Parker's Glow mobile tanning business had been removed from the windows, police said. Police initially said that Smith was cooperating and was not considered a suspect, but during a later press conference he was named the primary suspect in Parker's disappearance. For more information, visit <a href="http://www.facebook.com/michelleparkermissingperson" target="_blank">Find Michelle Parker</a>.

  • Nieko Lisi

    Nieko Lisi, 18, lives in Jasper, N.Y., about 40 miles from Elmira. According to relatives, Lisi was en route to Buffalo when he disappeared. He was last seen around 2 p.m. on Sept. 30, 2011, when he and friend Robert Knight, 20, stopped at Lisi's uncle's home in Addison, N.Y. Knight arrived at his parents' home in Michigan on the morning of Oct. 1, 2011. He allegedly told family members Lisi had dropped him off, but no one physically saw Lisi, police said. Lisi's family reported him missing and on Oct. 5, Michigan police went to talk to Knight about his friend's whereabouts. According to WETM-TV, Knight "suffered some sort of ailment" during police questioning and was hospitalized. Knight was released from the hospital on Oct. 9. The next day, Knight was found dead in his parents' home. Lisi is described as a white male, 5-foot-10-inches tall and 160 pounds, with brown hair and brown eyes. He has a tattoo of Chinese writing on the back of his right arm, a large angel on his right side and a large woman with a devil's tail on his left side. He was last seen wearing jeans, a T-shirt and a silver cross necklace. Anyone with information about Lisi's whereabouts is asked to call New York State Police at (607) 776- 6866. Lisi's family is offering a $2,500 reward for information leading to his whereabouts.

  • Kelli Bordeaux

    Pfc. Kelli Bordeaux, a 23-year-old Army combat medic, was last seen on April 14, 2012, leaving the Froggy Bottoms bar in Fayetteville, N.C. She was labeled a missing person two days later when she failed to show up for duty. The soldier has been married to her civilian husband for two years. Bordeaux is 5 feet and weighs 99 pounds. She was last seen wearing a pink halter top and black shorts. Anyone with information is asked to contact Fayetteville Police at 910-433-1856 or CrimeStoppers at 910-483-TIPS (8477).

  • Kelly Armstrong

    Kelly Armstrong, mother of a 2-year-old son, has been missing from Kokomo, Ind., since August 2011. Family members became concerned when they were unable to reach her. A missing person report was filed on Sept. 26, 2011. In February 2012, authorities charged Armstrong's boyfriend, Travis Funke, with voluntary manslaughter in her death. According to an arrest affidavit, Funke allegedly told investigators he killed Armstrong around the first of July, placing a plastic bag on her head, wrapping her in a tarp and putting her in a trash tote. The garbage container was supposedly picked up later that same day. Investigators spent six days sifting through 6,000 tons of trash at the local landfill, but were unable to locate Armstrong's remains. Armstrong's father, David Armstrong, doubts Funke's version of events. People interested in helping search or donating funds can do so at <a href="http://Operationfindkelly.yolasite.com" target="_hplink">Operationfindkelly.yolasite.com</a>. Anyone with information is asked to contact Kokomo police at 765-459-5101.

  • Robyn Gardner

    Robyn Gardner was last seen in Oranjestad, Aruba, on Aug. 2, 2011, traveling with Gary Giordano, an acquaintance she met on a dating website. Giordano claimed Gardner was swept out to sea while snorkeling in waters off Baby Beach. Giordano, 50, allegedly told police he had noticed a current pulling them out to sea and signaled to Gardner that they should return to shore. But when he got to dry land, she was nowhere to be found. Authorities conducted an extensive search of the area, but were unable to locate the 35-year-old Maryland woman's body. On Aug. 5, police took Giordano into custody before he left Aruba. Authorities held Giordano for four months in Gardner's disappearance, but he was released without charges in early December. Gardner vanished in the same Aruban town where teenager Natalee Holloway disappeared in May 2005. Gardner's whereabouts, like Holloway's, remain a mystery. For more information, visit the<a href="http://www.huffingtonpost.com/news/robyn-gardner" target="_blank">Robyn Gardner Full Coverage</a> page.

  • William "Billy" Disilvestro

    Billy Disilvestro, 28, has been missing since Feb. 7, 2011, when his grandmother dropped him off at a friend's house in Hamilton, Ohio. At about 2:30 a.m., DiSilvestro placed two calls -- one to his mother and one to his grandmother. Both calls went unanswered. What happened to DiSilvestro after that remains a mystery. According to police, the friend said DiSilvestro left the house after attempting to contact his mother and grandmother -- presumably for a ride. It is believed he was headed to his grandmother's house about 2 miles away, which would take him through a forested area called Milikin Woods. Authorities have conducted several searches of the area, but have yet to find any sign of the missing man. DiSilvestro is described as a white male, 6 feet 2 inches tall, 180 pounds, with black hair and brown eyes. He was last seen wearing jeans and a gray winter coat with fur around the hood. DiSilvestro has several tattoos, including the word SMOKE across his back, Jesus carrying a cross on his upper right arm, and a large angel on his upper left arm. Anyone with information regarding this case should contact the Butler County Sheriff's Office at 513-785-1300.

  • Susan Powell

    Susan Powell was reported missing by her family on Dec. 7, 2009, when she failed to show up for her job as a stockbroker at Wells Fargo Financial. Her husband, Josh Powell, told police he had been camping with their two children, then ages 2 and 4, and had last seen his wife around midnight. Suspicious of his story, investigators named Powell a "person of interest" in his wife's disappearance. Not long after, Powell and his two children moved back to his hometown of Puyallup, Wash. On Feb. 5, 2012, police say Josh Powell attacked his two boys, Charlie, 7, and Braden, 5, with a hatchet and then set his home on fire, killing the three of them in a gas-fueled explosion. Since that time, a mountain of evidence has emerged that supports law enforcement's decision to name Powell the prime suspect in his wife's disappearance. Nevertheless, her whereabouts remain a mystery.

  • Natalee Holloway

    Natalee Holloway, 18, from Mountain Brook, Ala., disappeared May 30, 2005, while on a trip to Aruba to celebrate her high school graduation. Holloway's classmates said they last saw her leaving Carlos 'n Charlie's nightclub with Joran van der Sloot, then a 17-year-old Dutch honors student living in Aruba, and his two friends, Surinamese brothers Deepak and Satish Kalpoe. All three young men would be arrested in the case, but they were released without being charged. On Jan. 13, 2012, van der Sloot, now 24, was sentenced to 28 years in prison for the slaying of Stephany Flores on May 30, 2010. The Peruvian business student was found dead in van der Sloot's hotel room in Lima that year. Van der Sloot was charged with first-degree murder and robbery in the case. Holloway's body has never been found.

  • Jessie Foster

    Jessie Foster has not been seen since March 29, 2006. According to her mother, Foster was living in Kamloops, British Columbia, in the spring of 2005, when she began traveling to the United States. In May 2005, the then 21-year-old ended up going to Las Vegas. While in Las Vegas, Foster met a man and the two were quickly engaged to be married. The man was reportedly wealthy and the two lived together in a million-dollar home. In 2006, Foster stopped calling her family. Concerned, they contacted her fiance and he allegedly said Foster had left him in April 2006. Foster's family promptly reported her missing to police, but with few clues to follow, the case quickly went cold. Foster is described as 5 feet 7 inches tall and 120 pounds, with blonde hair and hazel eyes. Anyone with information is asked to call Las Vegas Crime Stoppers at 800-222-8477. Foster's mother also maintains a website devoted to the case, which can be found at <a href="http://jessiefoster.ca" target="_hplink">jessiefoster.ca</a>. According to the site, a $50,000 dollar reward is being offered for information in the case.

  • Jesse Ross

    Jesse Warren Ross was a 19-year-old sophomore when he vanished on Nov. 21, 2006, while attending a mock United Nations conference in Chicago. According to police, Ross was last seen at about 2:30 a.m., leaving the Sheraton Hotel and Towers, where a conference dance was held. Surveillance footage from the hotel does not indicate Ross was intoxicated when he left. He was likely heading to his hotel, the Four Points Sheraton, about 10 minutes away. What happened to Ross after he left remains a mystery. For more information, visit <a href="http://findjesseross.com/" target="_blank">Findjesseross.com</a>.

  • Brittanee Drexel

    Brittanee Drexel, 17, was last seen by friends on April 25, 2009, when she left the Bar Harbor Hotel in Myrtle Beach, S.C., to meet friends at the nearby BlueWater Resort. Surveillance footage shows Drexel arriving at the resort, then leaving roughly 10 minutes later. What happened to her after that is a mystery. For more information, visit <a href="http://www.helpfindbrittanee.com/" target="_blank">Helpfindbrittanee.com</a>.

  • Corrie Anderson

    Corrie Anderson, a 36-year-old mother of three from Chautauqua County, N.Y., was last seen at about 1 p.m. on Oct. 28, 2008. Family members reported Anderson missing at about 3:45 p.m. that day, when she failed to show up at her son's school for a meeting. Two days later, a hunter discovered Anderson's car abandoned about 2 miles from her house. Authorities used ATVs, helicopters and dogs to search areas of interest in the case, but there's been no sign of Anderson. For more information, visit <a href="http://www.findcorrie.com/" target="_blank">Findcorrie.com</a>.

  • John James Morris

    John James Morris, 38, was last seen on July 30, 2007, in the driveway of his ex-boyfriend's residence on Whites Ferry Road in Dickerson, Md. According to police, Morris' ex-boyfriend was out of town on the day John stopped by to pick up his belongings. Morris has not used his credit card or cell phone since and, according to his family, he did not have his ADD (attention deficit disorder) medication with him when he disappeared. For more information, visit <a href="http://www.findjohnmorris.com/" target="_blank">Findjohnmorris.com</a>.

  • Lakeisha Nichole Archie

    Lakeisha Nichole Archie was last seen on Aug. 5, 2002. A family member dropped her off at a residence in the vicinity of Park Street and Buckeye in Sidney, Ohio, and she has not been seen since. Archie has a tattoo that reads "Lakeisha" on the right side of her neck, a tattoo of a black panther on her left forearm and tattoos of claws on each breast. For more information, visit <a href="http://www.blackandmissinginc.com/cdad/index.cfm?MissingInfoID=569" target="_blank">Blackandmissinginc.com</a>.

  • Ahren Benjamin Barnard

    Ahren Barnard was last seen in Boise, Idaho, on Dec. 4, 2004. He dropped his young son off for the evening with the child's mother and presumably drove home. His car was later found parked in his driveway, but he has not been seen since. For more information, visit <a href="http://www.helpfindahren.com/" target="_blank">Helpfindahren.com</a>.

  • Roxanne Paltauf

    Roxanne Paltauf was 18 years old on July 7, 2006, when she disappeared from the Budget Inn hotel in Austin, Texas. According to Roxanne's mother, Elizabeth Harris, Roxanne had been staying at the hotel with her boyfriend. The couple had an argument and, according to the boyfriend, she left the hotel, leaving all of her belongings behind. For more information, visit <a href="http://www.facebook.com/profile.php?id=100000644531428&sk=info" target="_blank">Find Roxanne Paltauf</a>.

  • William "Billy" Smolinski

    William "Billy" Smolinski, was a 31-year-old resident of Waterbury, Conn., when he disappeared Aug. 24, 2004. Smolinski told a neighbor he was going out of town for a few days to look at a vehicle. He has not been seen since and his truck was later found in his driveway. His keys and wallet were found inside. Investigators searched Smolinski's home and truck, and conducted several interviews but found no clues suggesting what might have happened to him. For more information, visit <a href="http://www.justice4billy.com" target="_blank">Justice4billy.com</a>.

  • Ray Gricar

    An esteemed district attorney, Ray Gricar was 59 years old in April 2005 when he vanished. He had served as the district attorney of Centre County, Pa., for nearly 20 years and was preparing to retire at the end of the year. On the morning of April 15, 2005, Gricar called his girlfriend, Patty Fornicola, and told her he was going for a drive on Route 192 toward Lewisburg. The following day, Gricar's red and white 2004 Mini Cooper was found locked and abandoned in a Lewisburg parking lot, not far from the Susquehanna River. Gricar's laptop was later found in the river but authorities never found any sign of the missing DA. For more information, read <a href="http://www.aolnews.com/2011/01/25/case-of-missing-pa-district-attorney-ray-gricar-baffles-police/" target="_blank">"Case of Missing Pa. District Attorney Baffles Police, Family"</a>.

  • Jason "J.J." Jolkowski

    Jason Jolkowski was 19 when he disappeared on June 13, 2001, in Omaha, Neb. Jolkowski, an employee at a local restaurant, received a call from his boss that morning and was asked to come in early. Jolkowski's car was in the shop so he arranged to meet a coworker at Benson High School, seven blocks from his home. It is believed that Jolkowski got dressed in his work uniform and then set off for the school. Somewhere along the way, he vanished without a trace. Jolkowski's mother, Kelly Jolkowski, has since founded Project Jason, a nonprofit organization created to assist the families of missing adults and children. For more information, visit <a href="http://www.projectjason.org" target="_blank">Projectjason.org</a>.

  • Carlos Diaz

    Carlos Diaz, of Bronx, N.Y., disappeared on Dec. 23, 1986, after he went out to bury a family pet. He has not been seen since. He is described as a Hispanic male with brown hair and brown eyes. He was 5 feet 8 inches tall and weighed 170 pounds at the time of his disappearance. He has a tattoo of the initials C.D. on his left hand. For more information, visit <a href="http://www.findthemissing.org/cases/59" target="_blank">Findthemissing.org</a>.

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