The acting warden of the Pontiac Correctional Center is under investigation by the Illinois State Police and has been placed on administrative leave.

Randy Pfister was arrested Thursday night.

Stacey Solano, a spokeswoman for the Illinois Department of Corrections, says a special prosecutor will be handling the case but would not give any details.

The Livingston County state's attorney's office refused to comment.

Pfister was released from Livingston County jail on Friday and did not post a bond.