Sixteen-year-old Parker Hess was shot and killed inside the Republic Volunteer Fire Company station in November 2016. A sophomore at Brownsville Area High School and a junior firefighter, Parker was in an office area of the firehouse while members prepared for the town’s Light Up the Night parade when a single bullet struck him in the face, and he died at the scene. The parade was canceled after the shooting.

The person who fired the shot was 21-year-old George Matis Jr., a captain at the same station and a friend of Parker’s. Matis was arrested immediately and charged with criminal homicide and recklessly endangering another person; he was held without bail. The community held a somber procession as fire apparatus escorted Parker’s body from the station to the coroner’s office, and departments and residents rallied around the family.

What details about that day or the people involved might help explain how a training-area interaction turned fatal?