MERCER, Pa. (WYTV) – 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 dead inside his cell.

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

Both men were being detained in a restricted housing unit.

Heverly was arraigned this 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.

The investigation is ongoing.