narrator: ncis asked a psychologist to create a profile of meghan's killer.ember of the victim's social groups, which made sense because they now knew whoever left those footprints had been wearing nike air force 1's. air force 1 was the hot shoe at the moment. believe me, we looked at a lot of air force 1 tennis shoes in different places, especially on young kids. that was the really sought after tennis shoe. narrator: but there were a lot of young people in meghan's life, not only at school, but in her neighborhood, too. and it was on megan's block that sergeant mcdaniel got his next lead. one of the neighbor's kids had a pair of air force 1's in the right shoe range that we were looking for. they were very close to meghan and her brother at the time. narrator: that neighborhood kid turned out to be the younger brother of one of meghan's close friends. meghan's parents were skeptical that he could be involved. i knew this kid, and he was harmless. he was kind of the younger of the group, but he always like followed them around. he never came up on my radar.

and so ncis had done some research into it.e were looking for, which helps, generally, so you narrow down your field. narrator: the team sent the killer's dna to a lab in florida. what did you find? we found that 72% sub-saharan african was the makeup of the killer. this person would self-identify as african-american. so we completely changed direction in our investigation. narrator: investigators looked through their records for anyone they might have missed and found a notation in a file. meghan took martial arts classes. the one that was running the studio at the time, it's an african-american owned business. narrator: the team asked the studio's owners to provide dna swabs. they all voluntarily came in and gave dna samples. narrator: none of those samples got a hit. then the detectives scanned through meghan's other extracurriculars. she'd also spent time at a teen center on base. someone there matched their profile. there was a counselor there that was african-american, and we talked to him. he seemed more like everybody's