He was sentenced to another 40 years in prison for his effort to have the prosecutor killed, the newspaper reported.
Savio, Peterson's third wife, was found dead in her bathtub in March 2004. Her death, initially classified as an accidental drowning, took place a month before she and Peterson were set to resolve outstanding financial issues from their divorce, according to Biography.com.
Savio’s death got a fresh look from authorities after the 2007 disappearance of Peterson’s fourth wife, Stacy Peterson, made national headlines. Investigators, who exhumed Savio’s body for a new examination, reclassified her death as a homicide.
Drew Peterson has maintained his innocence in Savio's death, as well as in the disappearance of Stacy Peterson, who has never been found. Drew Peterson's 37-year-old son, Stephen Peterson, is raising the couple's two children, who are now in middle school, the Tribune reported.
Stephen Peterson told the newspaper earlier this year that he's spent nearly a decade cleaning up his father's "mess," and that he believes his father "probably" killed both Savio and Stacy Peterson.
“I don't want to come out and say he did it ... but, I'm sure he did it,” Stephen Peterson said.