Leffler, a two-time winner on the Nationwide Series, was pronounced dead shortly after 9 p.m., New Jersey State Police said.
NASCAR driver Jason Leffler died after an accident Wednesday night in a heat race at a dirt car event at Bridgeport Speedway.
Kenzie Ruston stood out on the podium when the NASCAR Next field was revealed last weekend at Iowa Speedway.
By the time Dale Earnhardt Jr. reached Victory Lane last season at Michigan, the win seemed as much inevitable as implausible.
The Sprint Cup points leader, Johnson pulled away on both of the last two restarts that came over the final 10 laps to pull into Victory Lane at Pocono for the first time since 2004.
Jim Brown attended the NASCAR race at Pocono Raceway as a guest of Richard Petty.
There is another NASCAR winner named Burton.
Two sons of well-known Sprint Cup drivers headline the list of youngsters selected for this season's NASCAR Next program: Chase Elliott, son of 1988 champion Bill Elliott, and Jeb Burton, whose father Ward won the 2002 Daytona 500.
NASCAR remains a ratings winner for Fox.