Anthony Bertagna of the Santa Ana Police Department. (KABC) — Santa Ana police shot and killed a man after a foot chase late Sunday afternoon, authorities said.The incident began about 5 p.m. The man was pronounced dead at the scene.It was not immediately known what prompted the shooting, Bertagna said. Investigators at the scene were searching for possible witnesses and surveillance video.Anyone with information about the incident is asked to call the police department at (714) 245-8665. The detectives encountered a car, possibly parked on Birch or in an alley, when a man exited the vehicle and ran from the location, Bertagna said.The detectives chased the man through several buildings, and at one point an officer-involved shooting occurred, according to police. in the 400 block of Birch Street, where gang unit detectives were on patrol, said Cpl. SANTA ANA, Calif.