The story of former Illinois police sergeant and murder suspect Drew Peterson airs on Lifetime this weekend. Rob Lowe plays the controversial ex-cop suspected in the death and disappearance of this third and fourth wives. The 2007 disappearance of Peterson's fourth wife, Stacy Peterson, touched off an investigation that prompted authorities to reopen the case involving the accidental drowning of Peterson's third wife, Kathleen Savio. Peterson has repeatedly denied involvement in both cases, but was indicted in 2009 and charged with Savio's murder. He is currently awaiting trial. Last year, Peterson tried, unsuccessfully, to stop production on the TV movie about his case. "Drew Peterson: Untouchable" airs tonight at7 pmon Lifetime. full story