The Illinois Department of Corrections announced on Thursday that the Peterson was transferred to Menard Correctional Center in southern Illinois.
Peterson was incarcerated in the maximum security Pontiac Correctional Center after a short stay at Stateville Correctional Center.
The ex-suburban police officer was sentenced in the 2004 murder of Kathleen Savio. He's also a suspect in the 2007 disappearance of his fourth wife, Stacy Peterson.
Peterson has been in custody for nearly four years.