An interview takes a shocking turn — and answers a key question.See omnystudio.com/listener for privacy information.

Alone in the woods, at the 4Runner spot, this is what you hear.See omnystudio.com/listener for privacy information.

Jon exposes Robert's likeliest accomplice.See omnystudio.com/listener for privacy information.

A hermit. A mistress. A convict. Someone knows something.See omnystudio.com/listener for privacy information.

A fugitive who hid in Arizona for 28 years shares his story.See omnystudio.com/listener for privacy information.

Jon finds key photos — and interviews A.I. "Robert."See omnystudio.com/listener for privacy information.

A unified theory on Robert's plan — and fate.See omnystudio.com/listener for privacy information.

Jon reveals what likely triggered the murders.See omnystudio.com/listener for privacy information.

Robert loses control and spirals into a violent decline.See omnystudio.com/listener for privacy information.

Experts — and famous family slayings — offer clues.See omnystudio.com/listener for privacy information.