Erin Moriarty

Before we begin, just a trigger warning.

The following episode contains references to graphic physical violence.

Please listen with care.

I mean, Chris, do you believe that Daniel Marsh was a serial killer in training?

Almost four hours into questioning at the police station, Daniel Marsh admitted to FBI Special Agent Chris Campion that he had murdered Claudia Maupin and Chip Northup.

But he didn't stop there.

Campion learned the teenager was already thinking about his next killing.

You believe Daniel Marsh is a psychopath.

Campion maintained his composure, and then he asked Daniel a question that I had never heard in a police interrogation.

Campion had asked, how would you kill me?

And almost immediately, Daniel had thought of three different, gruesome ways that he would do it.

While Daniel was questioned, police had searched his mother's home.

There, they found writings, drawings, a knife, duct tape, and clothing with Chip and Claudia's DNA.

Police also searched Daniel's father's home.

When he found out his son was being questioned, he said he sent a public defender down to the police station.

Authorities finally had a suspect in Chip Northup and Claudia Maupin's murders.

And with physical evidence, DNA samples, and a complete confession, it seemed like the case against Daniel was solid.

But the fact that the suspect was a teenager would complicate things for the prosecution.

I'm 48 Hours correspondent Erin Moriarty.

This is 15 Inside the Daniel Marsh Murders.