(KAIR)--The cause of death for a Lansing Correctional Facility inmate is awaited through the results of an independent autopsy.

That word comes in a release from the Kansas Department of Corrections, which says 58-year-old inmate Charles Homer Roberson was found unresponsive in his cell on Monday.

Staff and EMS went to work administering life saving measures, but were unable to revive Roberson, who was pronounced dead.

The investigation into his death, pending results of the autopsy, is ongoing.

Roberson was serving a life sentence for Wyandotte County convictions of first-degree murder, aggravated robbery, aggravated battery, and forgery.