A rookie Sacramento police officer who died during a domestic violence call was ambushed by a gunman and had no chance of surviving after she was shot, police said. The disclosure came late Friday amid criticism that it took police 45 minutes to get to 26-year-old rookie Officer Tara O'Sullivan during the armed standoff. O'Sullivan was hit several times and one of the wounds was "non-survivable," Sgt. Vance Chandler said at a news conference where the department released police body camera video of the Wednesday night attack. Police Chief Daniel Hahn said the gunman had stashed two assault rifles, a shotgun, and handgun in different rooms and opened fire as officers knocked on the door.