Tony Stewart pulled out of the NASCAR race at Watkins Glen Sunday, 12 hours after the three-time champion struck and killed a sprint car driver who had climbed from his car and was on the darkened dirt track trying to confront Stewart during a race in upstate New York.

Greg Zipadelli, competition director for Stewart-Haas Racing, said at a news conference that Stewart ‘‘feels strongly’’ about not racing Sunday following Kevin Ward Jr.’s fatal accident. The decision was an about-face for the organization, which had said when the track opened that Stewart would be behind the wheel of his No. 14 Chevrolet when the green flag waved.

‘‘We gave Tony some time to sleep on it. He feels strongly this is the right thing to do,’’ Zipadelli said. ‘‘All you can do is what you feel is right, and we feel this is right. We get through today and do it the best we can as a group.

‘‘He’s going through a tough time. It’s emotional for him.’’

Regan Smith will drive Stewart’s car instead.

Ward had crashed following contact with Stewart one lap earlier and got out of his car as it was stopped along the fence. Video of the incident showed Ward walking from his crashed car onto the racing surface as cars circled by, and, as he gestured at Stewart’s passing car, he was struck.

Authorities questioned Stewart but said no criminal charges were imminent. Stewart traveled to Watkins Glen International following police questioning.

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