The gunman who murdered a Los Angeles County sheriff’s sergeant this week carried out a “calculated execution,” Sheriff Jim McDonnell said Thursday. Officials said the man wounded Sgt. Steve Owen and then stood over him and shot him four more times with a stolen weapon. McDonnell said the suspect, whom police identified as Trenton Trevon Lovell, searched Owen’s body for a firearm after killing him, “with the intent to use it to murder” another deputy who arrived at the scene. Lovell, 27, had been arrested 11 times before allegedly committing the attack, said McDonnell. Lovell led officials on a chase—during which he reportedly tried to steal Owen’s police vehicle, rammed another deputy, then took two teenagers hostage in a nearby home—before eventually surrendering.