(LA TIMES) A gunman who killed a Los Angeles County sheriff’s sergeant in Lancaster on Wednesday first wounded him, then stood over him and fired four additional rounds into the lawman’s body, Sheriff Jim McDonnell said Thursday.

“This was a calculated execution,” the sheriff said.

The gunman was carrying a stolen weapon and after the shooting unsuccessfully searched Sgt. Steve Owen’s body for his handgun “with the intent to use it to murder” another deputy who was arriving to the scene, McDonnell said.

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