The Maine Attorney General has found a state police trooper who opened fire on a man in Lincoln County last summer to have been justified in the use of deadly force.

On Aug. 15, 2016, Sgt. Jason Madore and several other troopers responded to a domestic violence call in Jefferson, where a man named Shane Prior, 34, of Cushing, had shot and injured his girlfriend at her friend’s home, according to a report from the office of Maine Attorney General Janet Mills.

[Maine is averaging more than one fatal police shooting per month in 2017]

Upon arriving in the town, the friend told police that Prior was armed with a .45 caliber handgun and had fled in a tan pickup truck. Soon after that, police pulled over the truck and heard a gunshot from inside.

Responding to the shot, Madore fired several shots into the truck. An autopsy determined that none of the shots hit Prior and that he had shot himself in the head with his own pistol.

“At the time Sgt. Madore shot at Mr. Prior, he reasonably believed that Mr. Prior presented an imminent threat of unlawful deadly force against himself and others,” states the attorney general’s report.

[How Maine police shootings are investigated]

It is standard practice for the attorney general’s office to investigate whether the use of deadly force by Maine law enforcement was justified.

In investigating the use of deadly force that resulted in a death, the attorney general’s office has ruled in every case since 1990 that the killing was justified.