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And i'm, like, "i wasn't. you did this. get away from me." >> he was saying that the police were saying you were involved? >> and i was, like, "okay." you know, "liar, " and he was, like, "i didn't, i didn't." >> but while both linda and the police were convinced gil was behind tom's death, investigators had no solid evidence. that grainy video didn't conclusively put him at the scene and they couldn't prove the sedative found in tom's system came from gil's office. the district attorney told his chief investigator they didn't have a case. >> we didn't have the evidence that i felt or that my ...

Thought, but almost a year later, it became crucial to the case. >> we got a dna report back from the lab that indicated there was an unknown male's dna on the inside of the belt flap of mr. kolman near the belt buckle. >> reporter: did you test this dna against gilberto nunez? >> yes. it was -- >> reporter: was there a match? >> not -- it was not his. >> reporter: no match? >> no match. >> reporter: where do you go from there? i mean, that is a -- >> that's a show-stopper. nothing moves in this investigation unless we can determine who that is. >> an unknown john doe. and that's a problem for...

And they considered another possibility that the dna belonged to an accomplice. >> we were also trying to get samples from people we had identified that were close to nunez. that's a little trickier -- because you just can't walk up and ask for the dna. we call it cast-off dna. and you would conduct a surveillance of those individuals and wait for them to discard an item that would most likely have their dna and then you collect that. >> reporter: what kind of items did you collect? i think there was a cigarette butt and maybe a can of soda. over many months, all the samples were processed, bu...

And he's, like, "they're tryin' to pin this on me and they say you were involved." and i'm, like, "i wasn't. you did this. get away from me." >> reporter: he was saying that the police were saying you were involved? >> and i was, like, "okay." you know, "liar," and he was, like, "i didn't, i didn't." >> referee:. >> reporter: but while both linda and the police were convinced gil was behind tom's death, investigators had no solid evidence. that grainy video didn't conclusively put him at the scene and they couldn't prove the sedative found in tom's system came from gil's office. the district a...