Peterson is charged with murdering his third wife, Kathleen Savio. He's also a suspect in the 2007 disappearance of his fourth wife, Stacy Peterson.
Glasgow says Peterson told a police officer in 2003 that he would be better off if Savio was dead because he would be financially ruined by a pending divorce. She was found drowned in her bathtub three weeks later, a gash to the back of her head.
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