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10/22/2012 07:25 am ET Updated Oct 22, 2012

'Unusual Suspects': Sociopath Teen Commits 'Most Heinous Crime Ever Seen In The Country' (VIDEO)

It was described by prosecutors at the time as the "most heinous crime ever seen in the country." The 1999 murder of a 9-year-old girl in San Diego remained unsolved for five years. That case was examined on the latest episode of "Unusual Suspects."

A tip led authorities to David Webb-Kim, who had been 16-years-old when his neighbor Amanda Gaeke was killed. When questioned, Webb-Kim confessed openly to abducting her and keeping her in his bedroom, unbeknownst to his parents.

He drugged, tortured and raped her for two days before ultimately killing her and dumping her body in the woods.

An investigator remembered his chilling demeanor, saying, "He never really showed any remorse about what he’d done. He never broke down. He was very matter-of-fact about the whole thing." Another said he "was a monster at 16-years-old" and a "sociopath."

He plead guilty to all of the charges leveled against him and is currently serving a life sentence in prison.

More shocking and disturbing true crime tales are told on "Unusual Suspects," Sundays at 10 p.m. ET on ID.

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