When emergency services arrived at the home of Kathleen and Michael Peterson in the early hours of December 9th 2001, they found a horrifying scene: Kathleen, dead, at the bottom of a staircase and blood everywhere. 

But quite what exactly had happened to her, would turn out to be one of the most confounding, and potentially bizarre mysteries of recent times.

Written by Diane Hope and produced by Richard MacLean Smith

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