His new book is unmasked. My life solving America's cold cases. Paul holtz, welcome to fresh air. Thank you for having me. You know, I think we should begin by just telling our listeners that we are going to be talking about some horrific crimes on the show today. And while we won't be giving graphic descriptions of crimes or crime, scenes, we will be talking about cases that involve murders and sexual assaults, so it may not be appropriate for all listeners. Paula want to start with a scene that's kind of at the end of the story of this quest for the Golden State killer. And this is at a point when you and other investigators have identified the guy you think is going to be him, a 72 year old guy named Joe Deangelo. You're nearing retirement from government service. And you do an unusual thing you take a visit to his house when he has so far had had no contact with investigators. Tell us why you went, what happened? Well, after 24 years of pursuing this Golden State killer, utilizing new technology, this genetic genealogy technology about a week prior I had been made aware that this Joseph Deangelo was possibly related to the Golden State killer, and after investigating him for a week, and realizing I was going to be retiring the following week, I decided he was a prime suspect, and every time I had a prime suspect in this case, I have to go see you. Where are they living? What are they driving? What is the neighborhood they're living in like? And so on a Monday, I drove up to Citrus Heights, California, which is in the Sacramento area, and parked in front of his house. His car was in the driveway. I knew he was home. But I have been here with prime suspects before, was he really the guy. And so I started debating. Well, I'm retiring tomorrow, actually just hurting my badge and gun in the next day. I'm not sure he really is the Golden State killer, so I started to debate. Should I just go knock on this guy's door? He's a former law enforcement officer. Maybe I can establish a bond saying, hey, you're a former cop. You understand how this goes. I'm looking into an old case. Chuckle chuckle, and let's just get this over with, give me a sample of DNA and you'll never be contacted by an investigator on this case again. If you're not the guy, but as I sat there, I realized the various aspects