Killer Drew Peterson moved because he was 'threat to safety and security' 03/09/2017 6:54 am PST Comments WGN via WGN: CHICAGO -- (WGN) -- We now know why convicted killer Drew Peterson was moved from a downstate prison to a federal lockup in Indiana. The state Dept of Corrections says a move was requested because Peterson was labeled as a "threat to safety and security of the department". Peterson was behind bars for killing his third wife when he was convicted of plotting to murder the prosecutor who put him there. The Dept of Corrections says Peterson needs to be continually monitored through his mail and telephone actions. FULL STORY: Killer Drew Peterson moved because he was 'threat to safety and security' - WGN Related Stories Illinois Supreme Court agrees to hear Drew Peterson appeal Update: Ex-cop/convicted wife-killer Drew Peterson appeals for pension Drew Peterson lawyers appeal murder conviction Drew Peterson found guilty in murder-for-hire plot Drew Peterson transferred to high-security federal prison Waiting for your permission to load facebook comments.