This is an I-Heart podcast.

On America's Crime Lab, the podcast, we're revealing the true story of the Idaho Four.

I was so frantic that morning and scared that the person who did this would come from me next.

They were struggling to identify a direction, a person of interest.

And I said, why wouldn't we work this case?

This three-part series features never before heard interviews about a crime that shook the nation

and the forensics lab that cracked the case wide open.

Listen to America's Crime Lab on the IHeart Radio app, Apple Podcasts, or wherever you get your podcasts.

I'm criminal psychologist, Dr. Michelle Ward,

and on season seven of Mind of a Monster,

we're bringing you the story of Kristen Gilbert.

We think that Kristen Gilbert is the most prolific mass murder on the East Coast.

The very person responsible for keeping you alive,

your nurse is secretly killing you.

She said to the nurse manager, if this guy dies, can I go home?

Listen to Mind of a Monster, the Killer Nurse, wherever you get your podcasts.

Welcome to this special bonus episode of Monster BTK.

Early in the process of making the show,

executive producer Payne Lindsay got a call from Carrie Rosson,

daughter of Dennis Raider, the BTK Killer.

They sat down together for an interview.

What came out of that was a five-hour conversation

...