Jason Leffler died Wednesday night following a crash in a 410 Sprint Cup car race at Bridgeport Speedway in New Jersey. He was 37 years old.
Leffler passed away shortly after 9 p.m., N.J. State Police said. He had to be extricated from the car after striking a wall half an hour earlier.
Leffler's car hit the wall twice and "then it was flopping all over," a witness said.
He was transported to Crozer-Chester Medical Center, and pronounced dead.
The track immediately announced the rest of the races had been canceled.
Leffler was a versatile driver who won championships in open-wheel divisions and attempted at least one full season in each of NASCAR's three national series.
Over the years, he made 73 starts in the Sprint Cup Series, finishing last in his final event after completing eight laps Sunday at Pocono Raceway.
He won twice in the Nationwide Series and once in the Camping World Truck Series.
The Long Beach, Calif., native, affectionately known as "lefTurn," has a five-year-old son.