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Before we begin, just a trigger warning.

The following episode contains references to graphic physical violence and suicide.

Please listen with care.

Hi, this is Corporper Island.

Hello?

This is Corporal Island. Who am I speaking with?

I want to remain anonymous. Is that okay?

For two months, police have relentlessly searched for the killer of

Chip Northup and Claudia Moppin. Officers had interviewed the family and people who knew the couple.

They'd set up a hotline to receive tips. But nothing had panned out.

And then, late on the evening of June 15, 2013,

911 dispatch received an anonymous call.

They transferred it to the Davis Police Department.

Okay. What are you calling to report, sir?

The double homicide that happened in April this year.

To determine if the caller was a crank or not, Corporal Scott Allen asked the person to share

details about the crime.

And then, he introduced the caller to Corporal Kyrrith Bresnick,

who knew more about the continuing murder investigation.

...