Republic Fire Captain George Matis, 21, was charged with criminal homicide in Parker Hess' death after he fatally shot the 16-year-old Brownsville Area High School sophomore inside a fire station in Fayette County, Pa., Pennsylvania State Police told KDKA-TV. The township is in Fayette County, around 45 miles south of Pittsburgh.
Meanwhile, Matis remained in Fayette County prison, facing a preliminary hearing December 7.
Besides being charged with criminal homicide, CBS Pittsburgh reported that Matis was also charged "with reckless endangerment charges".
Redstone Township police Officer John Brant arrived on the scene to find Hess unconscious and unresponsive, according to court documents.
He was pronounced dead at the scene.
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Hess was shot when Matis removed his legally owned gun from a holster and it fired, striking Hess in the cheek, state police said in a criminal complaint.
A litany of other fire stations and locals offered their condolences on the fire station's Facebook page.
ABC News reported that Light Up Night had been scheduled to happen on Sunday night, and the fire department's Facebook page said it involved "a parade and other events".
The victim and suspect in a fatal Republic fire station shooting were "good friends", according to state police.
In a statement, Brownsville School District Superintendent Philip Savini said: "We are saddened to hear of the loss of one of our students". School officials said counselors were to be available to students and staff.