A civilian witnessed the incident and pulled his vehicle between the suspect's vehicle and Corporal McKay, in an effort to shield him. The civilian, a former United States Marine, then exited his vehicle and rushed to the officer's aid. He grabbed Corporal McKay's gun, while his son called for help on Corporal McKay's radio. The civilian then ordered the suspect to drop his weapon. When the suspect refused, the civilian shot and killed the suspect."

If you read, I posted what the story behind the video.