Story highlights Driver spotted suspect walking on a Missouri highway

Deadly shootout occurred Sunday night

(CNN) The man accused of killing a small-town Missouri police officer during a routine traffic stop over the weekend has been taken into custody after a manhunt, the state patrol said.

Ian James McCarthy, 39, of Clinton, Missouri, was arrested Tuesday without incident after a driver reported that a man was walking on a highway in Henry County, Sgt. Bill Lowe of the Missouri State Highway Patrol said at a news conference.

Authorities located McCarthy at 6:15 p.m. in a mostly rural area about 12 miles southeast of downtown Clinton -- where the deadly shooting took place on Sunday.

He was not armed, Lowe said.

"I'm just glad he was apprehended," he said.

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