Correctional Officer Stanley Cole, Lieutenant William Thomas and Correctional Officer Robert Conkle were stabbed to death by inmates during a riot. Around 9:00am, about 500 inmates were returning to their cells in the North Cell House when a riot erupted. The inmates set fire to several buildings in the complex, resulting in an estimated $4 million in damages. Lieutenant Thomas and Officer Conkle were stabbed with shanks numerous times shortly after the riot began. Officer Cole was stabbed with a screwdriver. Correctional Center staff and Illinois State Police troopers were able to restore order and return the inmates to their cells 11 hours later. Seventeen inmates were charged with the murder of the Correctional Officers, but none were convicted.