A suspect is dead and an Arizona state trooper is recovering in the hospital after what authorities say was a rare case of a passerby using deadly force to assist an officer. Authorities say that when the passing motorist arrived at the scene of a vehicle rollover at a rural section of Interstate 10 early Thursday, he found the suspect beating trooper Edward Andersson, who had already been shot, CNN reports. The motorist asked the officer if he needed help, authorities say. When the trooper said yes, the man, who was with his wife, went back to his vehicle for his gun, told the suspect to stop, and then fatally shot the suspect after he refused to comply. Another motorist used the trooper's radio to call authorities.
Police say Andersson, a 27-year veteran of the force, was investigating a separate report of shots fired at the scene when he found the vehicle that had rolled over, reports the Arizona Republic. The trooper was setting down flares when he was ambushed by the suspect, whose shots injured the trooper's gun hand. The suspect was pounding Andersson's head on the pavement when the motorist arrived, authorities say. "My trooper would not be alive without his assistance," Arizona Department of Public Safety Director Frank Milstead says, per the AP. Andersson is being treated for gunshot wounds in the chest and shoulder. Investigators say a woman apparently ejected from the vehicle during the rollover was found dead at the scene. (Read more Arizona stories.)