(Bismarck, ND) -- The North Dakota State Penitentiary is reporting Chad Isaak has died due to self-injury.
Isaak was convicted back in August of 2021 of the killing of four people in Mandan. The North Dakota Highway Patrol was called to the penitentiary on Sunday following reports of a resident who had self-harmed. The trooper was told the inmate was taken by ambulance to Sanford Hospital, where he was later pronounced dead at 6:24 p.m.
Few details of the self injury are available at this time, and the incident is under investigation by the the North Dakota Highway Patrol and the North Dakota Department of Corrections and Rehabilitation.