The Nebraska Correctional Services Department says Robert Carter had been dealing with significant long-term health problems before he died Tuesday.
The 50-year-old was serving a 30-year sentence for several counts of robbery and for assaulting an officer. He wasn’t projected to be released until 2036.
Officials say Carter stabbed a correctional officer with a butter knife when he was being treated at a Lincoln hospital on Sept. 5.
Carter, who was from the Omaha area, was in the prison’s nursing care unit when he died.
A grand jury will investigate the death because Carter was in state custody.