Kristopher Peterson was 9 when his mother, Kathleen Savio, was found drowned in a dry bathtub in March 2004. He was 13 when his stepmother, Stacy Peterson, mysteriously vanished in October 2007. Kristopher Peterson was called before the grand jury investigating what befell both women. He later went on television and sat silently while his older brother Thomas proclaimed that "he highly did not believe" his father killed his mother. Two weeks after that interview Drew Peterson was arrested and charged with Savio's murder. Kristopher Peterson did not speak during his TV appearance.