NASCAR star Tony Stewart hit and killed another driver who was walking on the track in a sprint car race on Saturday night. The other driver, Kevin Ward Jr., had collided with Stewart on the previous lap, leaving Ward’s car with a flat tire and pushed into the wall. As officials threw a caution, Ward left his car and began walking down the track — gesturing angrily toward Stewart — before being clipped and dragged 50 feet by Stewart’s car. Several spectators told Bob Pockrass of The Sporting News that Stewart appeared to throttle his car before colliding with Ward.