AP Source: US Agent's Gun Used in San Francisco Pier Slaying

A law enforcement official says the weapon used in the shooting death of a woman on a San Francisco pier belonged to a federal agent. The official said Tuesday that a check of the gun's serial number shows it belonged to a federal agent. The official declined to elaborate. The suspected gunman, Juan Francisco Lopez Sanchez, has been deported to his native Mexico five times. He is suspected of living in the United States illegally when 32-year-old Kathryn Steinle was gunned down last week while walking with her father along San Francisco's popular waterfront area. Sanchez pleaded not guilty Tuesday to first-degree murder. He told two television stations who interviewed him in jail that he found the gun used in Steinle's killing wrapped in a shirt on the pedestrian pier where she was walking. Sanchez said the gun went off in his hands.