On the evening of March 5, 1944, a report was broadcast that Lieutenant Swanson, from the Army Camp Anza, was wanted by the police. This marked the beginning of a series of shootings on and around the military reservation where eight people were shot, three fatally.

Lieutenant Swanson forced a sergeant to drive through the camp's gate without lights and without stopping. He then ordered the driver to pull over on the wrong side of the road. Lieutenant Swanson then shot the driver of another vehicle through the side and forced him to drive (with the driver's wife and infant in the rear seat of the vehicle).

Having recently left their station, Officers Cole and Simpson of the Riverside Police Department saw the vehicle parked on the side of the road and went to investigate. Swanson confronted Officer Cole, with a .45-caliber automatic handgun in hand. Officer Simpson ordered Swanson to put the gun away. Instead, Lieutenant Swanson fired two shots, hitting Officer Simpson in the stomach. Officer Cole returned fire, hitting Swanson. Swanson was taken into custody and transported to the hospital in serious condition.

Officer Simpson was rushed to the County hospital, where he died shortly after his arrival. He had been a member of the Riverside Police Department since April 1, 1941.

Officer Arthur Simpson

Riverside Police Department Safe In His Arms Memorial