WARNING: Graphic Video

NASCAR Sprint Cup star Tony Stewart ran over and killed 20-year-old driver Kevin Ward, Jr. Saturday night at a dirt track in upstate New York.

Ward got out of his car after Stewart forced him into the wall, ending his race during a Super Sprint event at the Canandaigua Motorsports Park, a track north of Watkins Glen International, which is hosting the Sprint Cup race this weekend.

Stewart regularly competes at different races that take place outside Sprint Cup Series events.

Ward was gesturing angrily as he approached the NASCAR legend's car on the track. Witnesses allege that, though the yellow caution flag was out, Stewart gunned his engine which kicked out the rear wheels of his race car, clipping Ward who was then caught underneath before being thrown 50 feet away.

WROC-TV reporter Prescott Rossi reported via Twitter that Ward was dead on arrival at an area hospital and that an investigation into the incident has begun. Rossi quotes Ontario County Sheriff Phil Povero as saying that Stewart is complying fully with the investigation.

As of now, there is no word from NASCAR on Stewart's status for the race at Watkins Glen.