His colleague came to his home to pick up a patrol car.
An Arkansas police officer is facing manslaughter charges for allegedly shooting a fellow cop who was knocking on his door.
36-year-old Scott Hutton was shot dead through the front door of his colleague Calvin Salyers' home, while he was calling in to pick up a patrol car.
According to investigators, the 33-year-old Alexander PD officer had previously told another colleague that he would "shoot through the door" any protesters that came to his home, in the wake of unrest following the death of George Floyd in May.
He said he then realized who the man was, called 911 and attempted to perform CPR.
Hutton was rushed to hospital, but doctors were unable to save him. He was wearing a black polo shirt, khakis, a "typical" police officer belt, and his badge when he died, the affidavit stated.
Investigators found evidence the gun had been pressed against the door when it was fired, and that Hutton was "standing at an angle and not squarely facing the door" when he was shot.
As part of the investigation another officer, Sgt. Matt Wharton, reported that Salyers had previously warned that if any police brutality protesters came to his door he would shoot them through it.
The sergeant admonished him for the threat, calling such an action "reckless and negligent," insisting police should not shoot anyone without identifying them first and establishing they were a threat.
Salyers, who has been with Alexander Police Department since 2017, surrendered himself on Wednesday; his bond is set at $15,000.
A GoFundMe to raise money for Hutton's wife of five years says he "died in the line of duty"; it revealed he had "achieved his dream of becoming a police officer", having been medically retired following two tours with the United States Army National Guard.