NASCAR confirmed the death of the versatile driver, who was known by his nickname LefTurn, in a statement quoted by Sports Illustrated: "NASCAR extends its thoughts, prayers and deepest sympathies to the family of Jason Leffler who passed away earlier this evening. For more than a decade, Jason was a fierce competitor in our sport and he will be missed."
He was pronounced dead after 9 p.m., N.J. State Police told the AP. Leffler, 37, had won two Nationwide Series before his untimely death.
Leffler was racing 410 Sprint car heat race at the 5/8-mile when his car flipped multiple times, Christopher Taitt, 40, told USA Today. The witness said his car hit the wall and then was “flopping all over.” He was in second place at the time of the crash.
According to the news site, over the past four season Leffler had started in the Sprint Cups 11 times.
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His 5-year-old son, Charlie Dean, survives him.
"Really sad for Jason Leffler and his family," NASCAR Sprint Cup champion Brad Keselowski said on Twitter. "Thinking about his little boy.
The rest of Twitter reacted with condolences for his family:
Extremely sad to hear about @jasonleffler. spent a lot of time racing with him. Gone way too soon. Prayers to his entire family.
— Joey Logano (@joeylogano) June 13, 2013
Sending prayers up for Jason Leffler.Please pray
— Jan McMahan (@JanMcMahan) June 13, 2013
Very sad, gonna go to bed now. Prayers & thoughts 2 @jasonleffler son, family & friends.
— Michelle Sledd (@smoke14jr88) June 13, 2013
Prayers for Jason Leffler's family and friends. Rest in peace, walk with God.
— Jubilee Motorsports (@JubileeMS) June 13, 2013
— JLM (@JMartins_13) June 13, 2013
— Tyler Fitzgerald (@KBShow1878) June 13, 2013
My thoughts and prays go out to Jason Leffler's family.
— Rayne Rachels (@raynerachels) June 13, 2013
Prayers to Jason Leffler's family tonight. R.I.P.
— Chris Wilson (@14_31Racing) June 13, 2013
— MAY 25th (@MaddyLoveScotty) June 13, 2013