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Mike mcdaniel, david's first defense attorney, isn't buying that. >> i think he's a liar. >> you don't think he ever ran it? >> no, i don't think he ever asked anybody to run it. >> he told you he did? >> yes. >> so when he says that the prosecution is lying. >> lying means that you knowingly -- you tell a falsehood. i didn't tell him a lie. i told him what i thought was true. >> but whatever the truth is, now more than four years later, there was a name to that dna. >> do you allow yourself to think, here we are on our way to case closed, finally? >> absolutely. >> we've got a name -- >> sure...

Prints, he said he touched none of the bodies. then he says he heard david moving inside the house. >> and it clicked into my head, "he's goin' for a weapon." i mean, this guy is a former indiana state trooper. >> at which point he bolted from the scene. >> had i stayed there any longer, there's no doubt he would have killed me and he would have just lied and said to his buddies at the indiana state police, "i came home and i found this black guy." >> after listening to boney testify, the defense was ready to pounce. >> that's his story. and it makes absolutely no sense. but it explains away a...

To a couple of friends in honolulu, investigators with the state attorney general's cold case unit. >> i asked them to see if they can find anything else that we may have missed. >> and they did indeed find something using what was breakthrough science for that time, early 2009. cold case investigators extracted touch dna from sandra's shirt and bra. chief perry called larry with the news. >> and he said, they've got something. they rescanned her clothes and they found two -- how did he put it? two microscopic particles of a male origin. >> sometimes it is what you find and sometimes it is wha...

>> reporter: to daron wyatt, it felt more like fate. and just months later, in january 1997, his lieutenant suggested daron apply to the homicide unit. >> so i ended up putting in for that job and being selected. >> reporter: it wasn't long before he cracked open the doors that housed the homicide files. >> and i open the cabinet and i see the torrez case. and i remembered the incident with debbie from about a year earlier. so i pulled it out and i started reading just on free time, just reading it a little bit. >> reporter: by then, the cathy torrez case had been cold for a good three years. ...

Look. his name is matt murphy, and he noticed one thing right away. >> the first thing you see when you look at the file is a big rejection from really good lawyers who reviewed it individually and as a group. >> reporter: which means they tried very hard to make a case and they couldn't do it? >> they tried very hard. that's right. and they figured, based on their review, that they couldn't do it. >> reporter: and some of the reasons were apparent from the get-go -- >> when you look at it on its face, this case is a real tough one. >> reporter: for one thing, there was so much evidence they d...