>> before tom kolman. >> before tom kolman. >> same day? >> same day.t this person and said, "kind of always thought that was a sterile environment." and she said, "well, you should give that a check." so, we did. >> sure enough they got a match. turns out the dna belonged to the deceased male who'd been on the medical examiner's table before tom. so the dna had nothing to do with the case, but it did mean that some evidence had been contaminated. >> what are you thinking when you hear that? >> well, i'm thinking a couple things. i'm thinking, "that's gonna be a problem at trial because of the contamination." but i'm also thinking, "thank god, we get a little break. >> and after all the additional testing, the medical examiner finally had a cause of death, acute midazolam poisoning. investigators took everything they had to a special prosecutor and argued they were sure gilberto nunez had killed the man he called his best friend. >> i don't think that nunez was ever a friend to kolman. not for a minute do i believe that. he is a master manipulator. he l