BUTLER TOWNSHIP (KDKA) — One man is dead following a shooting Friday night involving an off-duty Pennsylvania state trooper in Butler County.

The incident happened around 8:45 p.m. at a home in the 100-block of September Drive in Butler Township.

According to police, 25-year-old Kristopher Barkus showed up at the home, which was occupied by the Trooper.

“Kristopher Barkus arrived at the residence uninvited,” said Trooper Dan Kesten. “He was located on the residence property near the front door.”

According to the Butler Eagle, Barkus was with another man when he went to the house. The trooper, who works at the state police barracks in Butler, was reportedly at home with his wife and kids.

Police say when the trooper answered the door, things quickly escalated.

Neighbors say they could hear a man yelling “Drop your gun!” then shots were fired.

“The trooper spoke to Barkus, and Barkus then brandished a firearm. At that time, the trooper stopped Barkus’ action by discharging his firearm,” Trooper Kesten said.

Barkus was flown to Allegheny General Hospital with a gunshot wound to his stomach and later died from his injuries.

Investigators say the man had gone to the trooper’s house in the past, and there were prior incidents where the Butler Township Police had to be called.

The investigation into the incident continues.

Stay with KDKA for the latest on this developing story.

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