Ex-cop and convicted killer Drew Peterson has been married four times. Three of his wives confessed to friends and family members that he was a violent abuser. His third wife, Kathleen Savio, called the police 18 times in three years before she wound up dead in her bathtub. She’d even sent letters to the state attorney’s office and local news outlets fearing for her life after repeated threats from Peterson. And his last wife, Stacy Peterson, has been missing since 2007. Now, in Drew Peterson: Killer-In-Law Drew Peterson’s sisters-in-law, Norma Peterson, and domestic violence awareness advocate and Stacy Peterson’s minister, Neil Schori, speak out about his disturbing patterns of behavior and what they knew before Kathleen’s death and Stacy’s disappearance