Brent Christensen

It's chilling that a human being, first of all, could do what he said he did to another human being.

But even more chilling that he could describe what he did with such pleasure.

He ultimately says to Tara on that recording that he decapitated Ying Ying.

But what was on that tape just got even more horrific.

Recorded evidence that Christensen may not have killed just one person, but many people.

Three decades ago, a young woman named Angie Dodge is found brutally murdered in Idaho Falls.

Police put a man behind bars.

But as the years pass, doubts emerge about whether the real killer was ever caught.

That's when Angie's own mother embarks on a decades-long mission to uncover the truth.

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Inside the Peoria federal courthouse, a recording has been played of Brent Christensen not only admitting to killing Ying Ying, but boasting that he had killed before.

I was 19.

The best person I would consider on my level to actually do anything had been me.

Either you have a bona fide serial killer and you better find his other victims, or he's just following a path of lies and deceit.

When we heard that, we took that very seriously.

So the FBI ran down all the leads they could, looked back at the places that he had lived, looked for missing persons at those locations.

Ultimately, we could not find any other victims.

That's not saying that there aren't any, but we've never been able to

find any other victims.