Relatives of a missing California teenager and the suspect arrested in connection with her disappearance and probable killing said yesterday that they hope police have made mistakes in the investigation.

A day after the Santa Clara County sheriff arrested Antolin Garcia-Torres on suspicion of kidnapping and murdering Sierra Lamar, his sister said police busted the wrong man. She's certain he didn't do it.

"It's not him," Lucero Garcia said to the San Jose Mercury News, about her 21-year-old brother.

Garcia-Torres' DNA allegedly matched evidence recovered from a bag that belonged to LaMar and was found on the side of a road after the 15 year old vanished in March.

"I honestly feel they don't have enough evidence to convict him," Garcia said to the Mercury News.

(Story continues below)

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  • Sierra LaMar

    Sierra LaMar, 15, vanished after leaving her Morgan Hills, Calif. home on March 16 and headed for school.

  • Sierra LaMar

    Police found LaMar's cellphone on Saturday, March 17 -- the day after she was last seen. Cops said they're searching her phone records for clues.

  • Sierra LaMar

    LaMar was a cheerleader in high school before moving to a new town, Morgan Hill, with her mother in October. Her parents are divorced and police said that both were cooperating with the investigation.

  • Sierra LaMar

    Police are treating LaMar's disappearance as a missing person case. Her parents insist it's unlikely that she ran away.

  • Sierra LaMar

    LaMar is 5-feet-2-inches tall with a thin frame. She was carrying a pink and black Juicy purse when she left home.

  • Sierra LaMar

    Anyone with information about LaMar may contact the Santa Clara County Sheriff's Office at (408) 299-2311

  • Sierra LaMar

  • Peter Robinson

    Deputy Peter Robinson, of the Santa Clara County Sheriff Underwater Search Unit, surveys a pond on Tuesday, April 17, 2012 in Morgan Hill, Calif. The search for missing 15-year-old Northern California girl expanded on Tuesday as investigators followed new leads one month since her disappearance. The Santa Clara County Sheriff's office would not say what the new leads were in the case of Sierra LaMar, except that they came from evidence already collected. The teen was seen leaving her Morgan Hill home on March 16. (AP Photo/Marcio Jose Sanchez)

  • Sierra LaMar

    A sign with a photo of missing teen Sierra LaMar is posted at an intersection on Tuesday, April 17, 2012 in Morgan Hill, Calif. The search for missing 15-year-old Northern California girl expanded on Tuesday as investigators followed new leads one month since her disappearance. The Santa Clara County Sheriff's office would not say what the new leads were in the case of Sierra LaMar, except that they came from evidence already collected. The teen was seen leaving her Morgan Hill home on March 16. (AP Photo/Marcio Jose Sanchez)

  • Santa Clara County Sheriffs underwater search unit

    The Santa Clara County Sheriffs underwater search unit prepares to lower a zodiac into Calero Reservoir to look for clues in the disappearance of missing teenage girl Sierra LaMar Tuesday, March 27, 2012, in Morgan Hill, Calif. LaMar disappeared as she headed out for school on March 16, and her cellphone and bag were found tossed in two separate locations shortly after. (AP Photo/Ben Margot)

  • Sierra LaMar

    HOLD FOR STORY: In this photo from Monday, March 26, 2012, posters bearing images of missing teen Sierra LaMar are seen at Burnett Elementary School in Morgan Hill, Calif. LaMar disappeared as she headed out for school on March 16, and her cellphone and bag were found tossed in two separate locations shortly after. (AP Photo/Ben Margot)

LaMar's mother, meanwhile, said during a press conference Tuesday that she thinks her daughter is still alive, contrary to authorities' conclusion that she's died.

"Her body hasn't been found," said Marlene LaMar, according to the Los Angeles Times. "I believe there was a reason she wasn't found. We're not giving up on that."

At times overcome with emotion, LaMar's mother publicly begged Garcia-Torres to reveal where he's hiding her daughter.

LaMar was last seen leaving her Morgan Hill home to catch the bus to school. She didn't arrive for classes, leading authorities to conclude she was kidnapped on her way to the bus stop.

Santa Clara County Sheriff Laurie Smith said there is "direct and circumstantial" evidence that LaMar was killed. She added that it appears Garcia-Torres picked her at random and acted alone, according to the Associated Press.

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