An interview takes a shocking turn — and answers a key question.

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Alone in the woods, at the 4Runner spot, this is what you hear.

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Jon exposes Robert's likeliest accomplice.

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A hermit. A mistress. A convict. Someone knows something.

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A fugitive who hid in Arizona for 28 years shares his story.

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Jon finds key photos — and interviews A.I. "Robert."

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A unified theory on Robert's plan — and fate.

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Jon reveals what likely triggered the murders.

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Robert loses control and spirals into a violent decline.

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Experts — and famous family slayings — offer clues.

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