Drew Peterson was transferred Friday from Will County Jail to Stateville Correctional Center to begin serving his 38-year sentence for the murder of his third wife.
The former Bolingbrook police sergeant was handed over to the prison outside Joliet around 9:30 a.m., the Will County Sheriff's Office confirmed.
A day earlier Peterson startled a courtroom when he screamed out his innocence before a judge sentenced him. "I did not kill Kathleen!" the normally cool Peterson shouted into a courtroom microphone from the witness stand.
Peterson was found guilty in September of murdering Savio. Her death was initially ruled an accident, after neighbors found the 40-year-old aspiring nurse's body in a dry bathtub at home. It was Stacy Peterson's 2007 disappearance that prompted authorities to take another look at Savio's death and eventually reclassify it as a homicide.
Drew Peterson is also a suspect in the disappearance of Stacy Peterson -- who was 23-years-old when she vanished -- but he hasn't been charged in her case.
Thursday's ruling came just a couple hours after Judge Edward Burmila denied a motion by defense attorneys to give the former cop a new trial and essentially means Peterson, 59, will spend the rest of his life in custody.
The judge gave Peterson four years' credit for the time he has served since his 2009 arrest.