this was the first time that i'd ever heard the name william talbott.not in the case file anywhere. his family home was just about 7 miles down the road from where jay's body was found. narrator: talbott, a never-married truck driver, had no criminal record, so his dna wasn't in codis, the genetic database used by law enforcement. investigators needed a sample of talbott's dna to either expose or eliminate him as a suspect in jay and tanya's murder. collins: they were having a really hard time getting a piece of evidence from him. narrator: but, eventually, talbott, who, after all this time, had no idea detectives were following him, discarded a paper coffee cup, which was seized and immediately tested for dna. detectives and analysts waited as their case, now more than 30 years old, hung in the balance. as i'm going along through the series of markers, they're matching, and so it's almost like winning a lottery, and you're saying, "okay, that's a match. that's a match." scharf: the odds of this not being william talbott was 1 in 180 quadrillion. you wo