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DATELINE WEEKEND MYSTERY SNEAK PEEK: Down the Back Staircase

Dennis Murphy sits down with Michael Peterson, who was originally convicted in 2003 of first degree murder after his wife Kathleen was found dead at the bottom of their staircase. The trial made national headlines, and Murphy has reported on this case for more than a decade. Airs Saturday, August 11 at 9/8c on NBC.

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