Karen Pipkin Guerrero

He said that Karen's car covered almost a football field before she crashed.

He said that Karen's car covered almost a football field before she crashed.

The FBI did its own investigation into Karen's death, and in the spring of 1975, they told the New York Times that Karen's death, quote, didn't appear to be a murder. No foul play, they said. Case closed.

The FBI did its own investigation into Karen's death, and in the spring of 1975, they told the New York Times that Karen's death, quote, didn't appear to be a murder. No foul play, they said. Case closed.

It wasn't only Silkwood's reputation that got attacked. Pipkin's credentials were questioned, too. And once Pipkin's name came out in the papers as being part of this investigation, his daughter, Karen Pipkin Guerrero, says he started getting menacing phone calls.

It wasn't only Silkwood's reputation that got attacked. Pipkin's credentials were questioned, too. And once Pipkin's name came out in the papers as being part of this investigation, his daughter, Karen Pipkin Guerrero, says he started getting menacing phone calls.

He just got threats that were, like, scary. Like, you know, death threats type things. Who they came from, I don't know. I have no idea. but my dad wasn't afraid.

He just got threats that were, like, scary. Like, you know, death threats type things. Who they came from, I don't know. I have no idea. but my dad wasn't afraid.

He was 100% positive that Karen Silkwood did not die from falling asleep at the wheel. And he believed that till the day he died.

He was 100% positive that Karen Silkwood did not die from falling asleep at the wheel. And he believed that till the day he died.

Other people thought there was more to the story too, and new investigators started digging.

Other people thought there was more to the story too, and new investigators started digging.

There's another person in this story we want you to meet, someone else who held on to things he'd collected in the Silkwood case until the day he died.

There's another person in this story we want you to meet, someone else who held on to things he'd collected in the Silkwood case until the day he died.

Joe Royer was a private investigator based here in Oklahoma City. Joe and I actually used to work together at a radio station here in town. He did sales and our nickname for him was Snake Oil Salesman. That's because he was always so well groomed. Joe had this full head of thick dark hair that he liked to slick back. He just looked like a million bucks every time he walked into a room.

Joe Royer was a private investigator based here in Oklahoma City. Joe and I actually used to work together at a radio station here in town. He did sales and our nickname for him was Snake Oil Salesman. That's because he was always so well groomed. Joe had this full head of thick dark hair that he liked to slick back. He just looked like a million bucks every time he walked into a room.

I never knew that Joe had been a PI back in the day. I actually used to be a PI myself. I dug around on Bill Clinton and Benjamin Netanyahu. So you'd think us both being PIs is something we would have talked about. But Joe kept that part of his past completely private, at least from me. And that included his work on the Karen Silkwood case. I only found out about that years later, after he died.

I never knew that Joe had been a PI back in the day. I actually used to be a PI myself. I dug around on Bill Clinton and Benjamin Netanyahu. So you'd think us both being PIs is something we would have talked about. But Joe kept that part of his past completely private, at least from me. And that included his work on the Karen Silkwood case. I only found out about that years later, after he died.

He was even tight-lipped with his wife, Jenny, and they were married for 45 years.

He was even tight-lipped with his wife, Jenny, and they were married for 45 years.