In this bonus episode, we speak with one of the country's most famous cold case investigators, Paul Holes who helped solve the Golden State Killer case using the latest in techniques to narrow down a sample of DNA that belonged to the prime suspect, Joseph DeAngelo. He tells host Laura Ingle how those same methods can be used to apprehend the Long Island Serial Killer.  Learn more about your ad choices. Visit megaphone.fm/adchoices