VIDEO: Gunman Stood Over and 'Executed' L.A. County Sheriff's Sergeant, Sheriff Says

A gunman who killed a Los Angeles County sheriff's sergeant in Lancaster, CA, 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, reports the Los Angeles Times .

Authorities identified the gunman as Trenton Trevon Lovell, a 27-year-old, of Lancaster with a long criminal record.

Lovell surrendered following a dramatic manhunt in which he tried to steal Owen's cruiser and used it to ram another deputy, then ran into a nearby home, where he took two teenagers hostage.

McDonnell spoke after an outpouring of praise for Owen in the Antelope Valley community.

Many mourners gathered Thursday at the Lancaster sheriff's station to pay their respects to a sergeant whom one resident described as "one of the good ones."

A GoFundMe page has been established to help Owen's family, reports KABC .

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Los Angeles County Sergeant Shot and Killed, Suspect in Custody