Authorities are investigating the death of an Illinois prison inmate at the Pontiac Correctional Center.

36-year-old Fabian Carrillo was found unresponsive on the floor of his cell early Tuesday. The death is being treated as a homicide.

A DOC spokesman said no sharp or blunt objects were found in the cell, and there was no sign of the use of those kinds of objects on the victim. Toxicology tests are pending.

Department of Corrections records show Carrillo was serving a 52-year sentence for a murder conviction out of Cook County and had been imprisoned since 2003.

It's the first murder at the facility in 24 years.

94.1 WGFA