Cellmate detained after inmate convicted of sexual assault found dead at California prison

California prison officials are investigating the death of an incarcerated man at California State Prison, Sacramento, as a homicide, authorities announced Wednesday.

Staff found 49-year-old John Cisneros unresponsive in his cell at about 9:15 p.m. local time on Feb. 23, according to the California Department of Corrections and Rehabilitation (CDCR).

Medical personnel began life-saving measures, but he was pronounced dead just before 10 p.m.

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