Three-time NASCAR champion Tony Stewart 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 on Saturday night. Kevin Ward Jr. 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...