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That he had an episode in his life that he's either blocked out or for some reason can't recall based on what was happening in his life at that time. >> reporter: cocaine puts holes in your brain, as they say. >> it does. >> reporter: amazing, this is a man who got away with murder for a long time and would have completely, scot free if it hadn't been somebody put the dna into codis. >> that's really remarkable. >> reporter: which is, it turns out, the subject of karen's new campaign. she is now on the side of the alaska state troopers and other law enforcement agencies trying to persuade ever...

With opportunity who returned home to anchorage from an out of town trip just the night before the murder, bonnie's step-father, karen's ex-husband, samantha's dad. >> and i remember that being a really unsure, really scary feeling. in my mind it didn't make sense. my dad is not and never has been a violent man. so i remember just straight up asking him, dad, did you kill bonnie? >> reporter: do you remember the look on his face when you asked him? >> he was devastated. he was completely devastated. but i just needed to hear it from him because there was so much uncertainty in my life at that ...

>> clearly she was not a party >> reporter: all these 17 years later, even here in court, cameron was grieving still. >> i loved her. >> reporter: so deep in love. but also far too busy, said the prosecutors, to sneak off for some secret tryst. >> she was working, she was in school, she didn't have time. >> reporter: and why kenneth dion? he was a married man with a newborn, a cocaine problem and a vastly different life. >> they came from two completely different worlds, and there was no reason for the two of them to have mixed together. >> reporter: anyway, said the prosecutors, there was phy...

>> bonnie's mother continues her own crusade. >> then after more than a decade of searching, a phone call. >> they got information there was a match. >> can we get a conviction on just the dna? >> and there was something else, something about bonnie herself. >> it was almost like she knew something. >> keith morrison with "justice for bonnie." >> good evening and welcome to "dateline." i'm lester holt. we often see headlines about dna evidence exonerating the innocent. it seems we hear less about how dna is used to track down the guilty. in a story you're about to see, a sample found...

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