police say talbott was a rapist hunting for a victim.think he may have befriended jay and tanya or may have threatened them at gunpoint. they ended up in jay's van, and once they were under the gun, they were helpless. he tied them up with the plastic zip ties he'd brought along for just that purpose. without knowing it, he left his dna on those plastic ties. he strangled jay. then he raped tanya, creating even more dna evidence. he shot tanya and then disposed of both bodies at separate locations. at some point, amid all this activity, talbott left a partial palm print on the back of the van. he really set out with a premeditated plan that day or that evening to carry out some -- some form of heinous crime, which, unfortunately, he did and just somehow crossed paths with tanya and jay. narrator: in june of 2019, william talbott was convicted of aggravated murder and sentenced to two consecutive life terms without the possibility of parole. his case is a forensic first. the suspected golden state killer was exposed by genetic genealogy.