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Homicide. there have been great advances in forensic science. what they probably did in processing the scene, of course, collecting a lot of evidence, looking for dna, we do believe that at least a couple of the victims fought back. they had defensive wounds. they might have found skin cells underneath fingernails. they may have found blood during the analysis that did not match any of the victims and they were able to type it and they knew they had unknown dna. then the question is, how do you match it up? and again, they went through codis. if you haven't been arrested for specific offenses ...

Scene and find unknown dna and they think it's significant, they will put that unknown dna through the codis database to see if there is a hit, a match. if isn't, it remains unknown dna. that's when they take it to the public dna databases, the ones that do allow law enforcement to go there. they run it. if there are any familial hits, and it can be distant relatives, that gives them a working knowledge right there to narrow it down to look and try to find that potential suspect. if they find someone they believe is a credible potential suspect, they then have to get the actual dna from that p...

Much. and i'm joined now by cnn's jean casarez, who is right outside the correctional facility in pennsylvania, where the suspect is being held. you've been talking to your sources and you're learning new details about how police zeroed in on the suspect. what more can you tell us? >> it has to do with the dna because a source familiar with the investigation tells me that it is genetic genealogy that led them to identify, in part, this suspect. and genetic genealogy, they found dna because we know that -- and that was unknown dna, i am told. so, the unknown dna routinely is put through a codis...

A male leg hair was found under a label of one of the envelopes, and the dna came back matching nobody. no one in the moore family or any one of the codis database, anyway. odd. had it been planted there to throw off investigators? then one of these envelopes finally gave up what appeared to be a real clue. >> there was a dna profile from fingerprint ridge detail on the back of one of the stamps that was affixed to the envelopes that one of the letters was sent in. >> so what came back from these dna tests? >> the contributor of the dna from the fingerprint material was similar to paul moore. ...

A label of one of the envelopes, and the dna came back matching nobody. no one in the moore family or any one of the codis database, anyway. odd. had it been planted there to throw off investigators? then one of these envelopes finally gave up what appeared to be a real clue. >> there was a dna profile from fingerprint ridge detail on the back of one of the stamps that was affixed to the envelopes that one of the letters was sent in. >> so what came back from these dna tests? >> a contributor of the dna from the fingerprint material was similar to paul moore. >> reporter: case closed. right? n...