The Staircase Mystery: Innocent? Or Did a Murderer Walk Free?

Notoriously dubbed "The Staircase Killer" in the media, Michael Peterson insists he is innocent, and that his wife Kathleen's fall down the stairs was an accident. But prosecutors claimed Peterson's wife discovered a secret that could have been motive for murder. Peterson discusses how his children reacted, plus a truly shocking theory of how some believe his wife may have really died.