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Now Playing: Margaret Rudin spends two decades in prison, appeals for a new trial: Part 10

Now Playing: Lori Vallow's sister speaks out after J.J. Vallow, Tylee Ryan are found dead: Part 11

Now Playing: Police investigation leads to shocking discovery: Part 10

Now Playing: Investigators say Alex Cox’s phone points them to missing kids J.J. and Tylee: Part 9

Now Playing: Alex Cox dies shortly after getting married: Part 8

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Now Playing: Lori Vallow moves to Idaho after husband’s death: Part 4

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