MERCER, Pa. (WKBN) – Pennsylvania State Police say an inmate at the state prison in Mercer County killed another inmate.

Troopers were called about 10:50 p.m. Monday to SCI Mercer where they found 35-year-old Jason Kelly inside his cell. Corrections officers discovered him just before 9 p.m. during a routine check, according to the Pennsylvania Department of Corrections.

Investigators say Kelly’s cellmate, 35-year-old Darl Heverly, strangled him with a bedsheet.

Kelly was taken to the hospital, where he was pronounced dead.

Both men were being detained in a restricted housing unit.

Heverly was arraigned Tuesday morning on criminal homicide, aggravated assault, assault by a prisoner, simple assault and recklessly endangering another person. He’s scheduled to appear in court again on December 16.

Kelly was serving a five- to 10-year sentence for a robbery in Allegheny County. He had been at SCI Mercer since March 2019.

KDKA reports that Heverly was sentenced for the kidnapping of a woman in Union County.

Representatives of SCI Mercer declined to comment further.

Pennsylvania State Police are investigating.