COEUR D’ALENE, Idaho — A man charged in the killing of a northern Idaho police officer was acting in self-defense, his attorneys said on the first day of his trial.

The first-degree murder trial of Jonathan Renfro, 29, began Monday, the Coeur d’Alene Press reported ( Renfro is charged in the shooting death of police Sgt. Greg Moore.

The court heard testimonies from 10 witnesses, many of which were Coeur d’Alene police officers who recounted the events of the May 2015 shooting. Prosecutors also showed body camera footage of Moore interacting with Renfro moments before the shooting.

County prosecutors said the defendant wanted to kill Moore as Renfro was high on methamphetamine and was in possession of a stolen gun. Moore was shot in the face with a 9mm handgun while on a routine patrol.

Defense attorneys said that Renfro was high from methamphetamine that a friend had injected him with, but he went out walking to clear his head that morning. Attorney Linda Payne said that when Moore confronted Renfro and the officer reached for his sidearm, Renfro acted in self-defense.

“It was an instinctual reaction,” Payne said. “There was no intent to kill, there was no blackened and malignant heart, he is not guilty of first-degree murder, he is guilty of . manslaughter.”

Leading up to the trial, Renfro previously pleaded guilty to grand theft and eluding a law enforcement officer.

The trial continued Tuesday.

Information from: Coeur d’Alene Press,