https://www.answers.com/motorsports/Did_Jason_leffler_die
Did Jason leffler die? - Answers
Yes, caused by a dirt car crash
jason lefflerdieanswers
https://www.autosport.com/nascar/news/jason-leffler-dies-from-injuries-in-a-sprint-car-crash-4467278/4467278/
Jason Leffler dies from injuries in a sprint car crash
NASCAR Sprint Cup driver Jason Leffler has died from injuries sustained in a sprint car crash on Wednesday evening
jason lefflersprint cardiesinjuriescrash
https://theworld.org/stories/2016/07/30/fans-stunned-nascars-jason-leffler-dies-crash
Fans stunned as NASCAR's Jason Leffler dies in crash - The World from PRX
NASCAR driver Jason Leffler, 37, died after an accident Wednesday night at a dirt car event in New Jersey.