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>> chief perry was struggling to tell us that he did know what it was like to lose a child. it came out of retirement and took the job as head of the kauai police department after the sudden death of his 26-year-old son, erickson. >> i feel, and away, that i am working through him. that he motivates me. i believe that. things happen for a reason. in fact, i told larry this. i told him, there's a reason why we met. i don't know what the reasons are, but i am here for you. >> so, after meeting with larry, chief perry sent sandra's file to a couple of friends in honolulu, investigators with the s...

Larry mendonca the help he was pleading for. touch dna, microscopic skin cells on sandra's shirt and brawl. it was a match to darren. >> when that result came in, tell me what your first thoughts were? >> we got him. >> but larry was weary. >> it isn't over yet. >> because what seemed like great evidence to the cops did not to the newly elected prosecuting attorney shailene. for one reason, that the united not exclusively match darren. >> it could have come from the two children. >> larry, the, refused to be discouraged. >> the driving force is to get this case solved. but my daughter to rest....

Clearly not true. >> there is something in the field of dna analysis called "touch dna." # lab experts use human cells to make an identifying hit on a suspect. touch dna from boney's skin cells was found on kim camm's sweater, her underwear, and on her daughter, jill's, shirt. >> the dna conclusively proves that he absolutely fought with kim, that he touched jill. >> and the defense hoped its cross examination of boney would be still more proof. camm had to steel himself to watch boney on the stand. >> you're looking at him. >> right. there was no way for me to actually prepare myself for that...

>> and camm had a solid alibi. eleven men had seen him playing basketball from a little after seven to about nine-twenty that night. there was no one to support any part of the story boney had just told. >> there is not one shred of evidence that puts those two people together. >> reporter: richard kammen was a new face on the defense team. >> and the reason there's nothing there is 'cause it didn't happen. >> reporter: the defense insisted boney was the sole killer in the garage that night and that back in 2000, investigators ignored evidence pointing to the convicted felon. to make that poin...

>> and then your emotions are going wild, this guy's tried to kill ya, you're in a crime scene, you're gonna stop, we have to believe that you could say, "oh, shoes, i gotta put these now on top of the vehicle." charles, doesn't make any sense. doesn't make any sense. >> no, no, no, see, here's the thing, i'm wiping the shoes off and i see one little leg or something hanging out the passenger side. i go to investigate to see if there's anyone else in the back of the vehicle. and when i leaned into look, i put the shoes on top. i don't even remember doing it. >> doesn't remember doing it and he...