Rachel Koechner, Zoee Sandner
In this undated photo released by Chariton County Sheriff's office, Rachel Koechner and her 4-year-old daughter Zoee Sandner are shown. The central Missouri woman who has been missing with her daughter for four days called her boyfriend from a suburban Kansas City motel but was gone when police arrived to check on her. Authorities say they're believed to be with Koechner's former husband and are considered endangered because of previous domestic violence incidents. (AP Photo/Chariton County Sheriff's Office)
Jennifer Kesse
Jennifer Kesse has been missing from Orlando, Fla., since January 24, 2006.
It is believed she was abducted from her apartment complex early that morning.
On Jan. 26, 2006, Kesse's car was found abandoned at a condominium complex located roughly one mile down the road from where she lived. Valuables were found inside the vehicle, leading police to believe Kesse was not the victim of a robbery or carjacking. Police bloodhounds tracked a scent from where the car was found back to Kesse's condo, but the trail ended there.
At the time of her disappearance, Jennifer Kesse was 24 years old, 5'8" tall and 135 pounds. She had shoulder-length sandy blonde hair and green eyes. Anyone with information in the case or who would like to donate to search efforts can do so at <a href="http://www.findjenniferkesse.com/" target="_hplink">Findjenniferkesse.com</a>. Tipsters can also call the crime line anonymously at 800-423-8477.
Jacob Tipp
Jacob "Jake" Lipp, 27, is missing from North Huntingdon, Pennsylvania, last seen Dec. 16 in Pittsburgh by his girlfriend.
Lipp and his girlfriend were at the Static Bar in the strip district. They got into a fight and the girlfriend drove off leaving Lipp at the McDonald's on Penn Avenue, at around 3 a.m.. The girlfriend came back to get him and he was gone. He has not been seen since.
Lipp is 5'6" tall, 160 pounds with black hair and brown eyes. (Missing Persons Of America)
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 cellphone, 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 Department, Indiana State Police and the FBI have all conducted searches for Spierer.
Lauren Spierer is described as a white female who is 4-foot-11-inches tall with a slender build. She has 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.
Yelekal "Kal" Alemu
Yelekal "Kal" Alemu, 23, of Lawrence, Kansas, was last seen by friends and family on the morning of May 12, 2012. He was reported missing later that day when he failed to show up for a family gathering.
The same evening Alemu was reported missing, authorities found his vehicle abandoned on private property in rural Douglas County, southeast of Lawrence.
Alemu is 5-foot-10 and weighs 170 pounds. He has short hair and a full beard. He was last seen wearing a striped grey shirt.
Anyone with information on Alemu's whereabouts is asked to contact the Lawrence Police Department at 785-832-7509 or the Douglas County TIPS Hotline at 785-843-TIPS.
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 bath remodeling 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.
Vilet Patricia Torrez is 5-foot-3-inches tall, 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-foot tall 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 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. Funke allegedly said he placed a plastic bag on Armstrong's head, wrapped her in a tarp and put 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 had 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 Natalee Holloway went missing 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. On that day, 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 two 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-foot-2-inches tall, 180 lbs., 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 Josh 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 all three were released without charge.
On Jan. 13, 2012, now-24-year-old Van der Sloot 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 on June 2 of that year. Van der Sloot was charged with first-degree murder and robbery in the case.
Natalee 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 U.S. In May 2005, the then 21-year-old ended up going to Las Vegas, Nev.
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 fiancee 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-foot-7-inches tall and 120 lbs., 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, Ill.
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. It is believed he was headed to his hotel, the Four Points Sheraton, which was located about ten minutes away. What happened to Ross after he left the Sheraton Hotel 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 remains a mystery.
For more information, visit <a href="http://www.helpfindbrittanee.com/" target="_blank">Helpfindbrittanee.com</a>.
Willie Michael Wheaton
Willie Michael Wheaton, 57, was last seen at a Greyhound Bus Station in Jackson, Miss., on the evening of June 17, 2006. Wheaton boarded a bus that was en route to Sacramento, Calif., but it is unknown if he ever arrived.
For more information, visit <a href="http://www.blackandmissinginc.com" target="_blank">Blackandmissinginc.com</a>.
Corrie Anderson
Corrie Anderson, a 36-year-old mother of three from Chautauqua County, N.Y., was last seen at about 1:00 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 approximately two miles from her house.
Authorities used ATV's, helicopters and dogs to search areas of interest in the case but to date they have found 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 to pick up his belongings. Morris has not used his credit card or cell phone 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 August 5, 2002. A family member dropped her off at a residence in the vicinity of Park St. and Buckeye in Sidney, Ohio, and she has not been seen since. Archie has a tattoo of the name "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 went missing on 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 parked in his driveway. His keys and wallet were found inside.
Investigators searched Billy'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. He had served as the district attorney of Centre County 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 nearby 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 years old on June 13, 2001, the day he disappeared 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, only 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 Jason 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 went missing from his Bronx, N.Y., home on Dec. 23, 1986. Diaz went to bury a family pet that had died and has not been seen since. He is described as a Hispanic male with brown hair and brown eyes. He is 5-foot-8-inches tall and weighed 170 lbs. at the time of his disappearance. He has a tattoo with 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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First Posted: 01/05/12 04:25 PM ET Updated: 01/06/12 08:55 AM ET