We just tried to think of him as gone. This case is one of those cases that just really sticks with you. Nobody wanted to give up on this case. Narrator luckily, the lead investigator, jim scharf, was a man who knew more than most people about working a cold case. Ive mentioned to people before that if anything happens to me, i want him to investigate what you know, try to find the perpetrator. Narrator in 2018, the alleged golden State Killer was finally behind bars, thanks, said prosecutors, to a new forensic tool called genetic genealogy. We knew we could and should solve it using the most innovative Dna Technology available at this time. Narrator the question now was whether that science could reveal who killed jay and tanya