Story highlights Wounded officer has served on the force for 20 years

Gunman was killed Monday after firing at officers again

(CNN) St. Louis Police have killed a gunman they say wounded an officer in a shooting ambush on Sunday.

Authorities on Monday identified the suspect as 19-year-old George P. Bush III.

George P. Bush III

Around 7:30 p.m. Sunday night, a gunman pulled up in a silver car next to a marked Chevy Tahoe and opened fire, St. Louis Police Department Police Chief Sam Dotson told reporters. The shooting happened hours after a Texas cop was ambushed in a fatal shooting. Police there are still searching for a suspect.

One officer, a 46-year-old sergeant and 20-year veteran of the force, was shot twice in the head but is expected to survive.

"This officer was not trying to pull this car over," Dotson said. "This officer was driving down the road and was ambushed."

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