State police at Clearfield said Saturday an inmate at the Houtzdale state prison allegedly assaulted another inmate around 1 p.m. Friday.
Police said Lawrence Edward Peterson Jr., 43, was charged with aggravated assault.
Police said said the incident occurred as Peterson and the 59-year-old victim returned to their cell after completing a work assignment.
The two were cellmates.
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Police said Peterson then began punching and kicking the victim in the head and shoulder area.
The victim reportedly suffered severe head injuries and was airlifted to UPMC Altoona.