A local union representative for the American Federation of State, County & Municipal Employees says a prisoner headbutted a guard on Friday, causing the correctional officer to suffer a concussion and require treatment for the injury.
Illinois Department of Corrections spokesman Tom Shaer says three other officers were present when the incident happened. Shaer says the department is investigating and the inmate has been transferred to a maximum security facility.
Authorities say the officer should return to work in four to five days.