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That was a full profile, what we call a majorminor. The profile on the Candy Wrapper was a great quality profile. Narrator investigators knew that killers who resort to the kind of overkill seen in Sierras Murder have usually killed before or have at least committed violent crimes, so they were confident theyd find a Dna Match to their killer in codis, the national dna database. Well, i think were going to solve it immediately. I think, okay, if we put this in codis and we get a hit, then case solved. Narrator but it was not to be. Despite the high quality of the killers dna profile, there wer...

Narrator but detectives had something going for them. Blake had no idea they were looking at him. Mcgee so one of our guys went into a local bar, had a beer with Blake Russell. He actually had this crazy story about how he was going to make a Beer Bottle Christmas Tree for his grandmother and asked blake if he could have the beer. Blake gave him the Beer Bottle. He walked out and brought it to monica. The Dna Test results left no doubt. The dna from the Beer Bottle matched the dna from under sierras fingernails and from the Candy Wrapper at the crime scene, incontrovertible proof that Blake Ru...

But that information is just coming from the dna. Narrator of course, you cant tell how a person parts their hair or if they have tattoos or scars or their exact age. But in dozens of cases, snapshot has used dna to put a face where none existed before. If you reflect on what were doing, it shouldnt sound like science fiction. Narrator the chief suspect in Sierras Murder was a mexican construction worker. But investigators were in for a shock. This was the image snapshot created of the man who killed sierra bouzigard. He wasnt hispanic. He was caucasian with blue eyes. This meant they had been...

I wasn't there for her when she needed me. when i found that she wasn't alive, it's like, "why her? why not me? should've been me." narrator: sierra's lifestyle might or might not explain what looked like a sex crime. mancuso: she was using prostitution to help support her drug problem. i don't want to use the word "gypsy," but she really just kind of lays her head wherever she can find a spot. mcgee: sierra lived a high-risk lifestyle. her background may have affected me a little different than it does others, because i grew up in a community where people ended up like sierra. and so i saw my...