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Eric Knysz, the man convicted of killing Michigan State Police Trooper Paul K. Butterfield, is hospitalized in critical condition after attempting suicide in his Jackson prison cell, WZZM-13 reported Monday night.

Knysz, 20, of Irons, was found hanging Monday afternoon in his cell at Charles Egeler Reception & Guidance Center, according to the Mason County Sheriff's Department. He was rushed to Allegiance Health Hospital and is reportedly on a ventilator.

He was sentenced April 8 in Mason County Circuit Court to life in prison in connection with Butterfield's September 2013 death.