On February 2, 1958, Ontario Detective Russell Grower, a Pomona Police Detective, and a Monte Vista Police (now Montclair) Detective, took one of their private vehicles to Soquel Canyon in Chino Hills to follow-up a tip on a gang of tire thieves. At 2:15 p.m., Detective Grower knocked on the door and was met by the suspect. When Grower identified himself, the suspect attempted to close the door. As Grower advanced, the suspect shot him in the forehead. Unable to capture the fleeing suspect, the detectives transported Grower to the nearest hospital. Detective Grower had already lost his battle for life. The suspect was later captured and prosecuted for murder.