Ontario Provincial Police in Loyalist Township laid a first-degree murder charge in the death of an inmate at Millhaven Institution, west of Kingston.
Police say they were contacted by Correctional Services just after 8 a.m. April 21, advising them of an inmate who had been assaulted and pronounced dead at the scene.
The identity of the victim, a 70-year-old man, is being withheld due to the nature of his charges and conviction.
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Joseph Bedard, 43, also an inmate, has been charged with first-degree murder and will make a court appearance by video in Napanee on April 22.