Man who killed officer said he was hit by ultrasonic waves

At his house a few blocks away, he casually chatted with his roommate as if nothing happened and even went outside to
watch as police from around the region began rushing to the shooting scene, Davis Police Chief Darren Pytel said Friday.
"He shouted some stuff, went back in and came back out with a firearm, then went back inside, pushed a couch in front of
the door and officers heard a gunshot," Pytel said.

Police eventually sent a robotic camera in and found the gunman had shot himself in the head.

Police found the handguns in the home.

The shooting devastated the Davis Police Department, which has about 60 sworn officers and about 30 other employees.

Corona was the first officer in the department to die in the line of duty since 1959. She had only been patrolling solo for
about two weeks, the chief said.

A candlelight vigil for the slain officer was held Saturday night.