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NASCAR driver Jason Leffler died after an accident Wednesday night in a heat race at a dirt car event at Bridgeport Speedway in Swedesboro, N.J. The 37-year-old Leffler is survived by 5-year-old son Charlie Dean.

Here's are some tweets from fellow drivers:

"Thoughts and prayers to the family and friends of Jason Leffler. A good man; a good racer. Godspeed friend." — Stewart-Haas Racing, the NASCAR team co-owned by Sprint Cup driver Tony Stewart.

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"Really sad for Jason Leffler and his family. "Thinking about his little boy." — NASCAR Sprint Cup driver Brad Keselowski.

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"Just got out of my Dirt Car after the A-Main to learn about Jason Leffler. I raced ALOT and talked ALOT to Jason, I AM SAD." — NASCAR Nationwide driver Kenny Wallace.

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"Another reminder of how this sport we love can be so cruel. Thoughts with his family. #LEFturn." — IndyCar driver Justin Wilson.

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"Deeply saddened by the passing of Jason Leffler tonight. Please keep his family in your thoughts and prayers. #LEFturn" — NASCAR Sprint Cup driver Kyle Busch.

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"Very sad night. What a great guy we lost tonight. Rest in Peace Jason." — NASCAR Sprint Cup driver Kasey Kahne.

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"So sad to hear about Jason Leffler. Was a wheel man and a fun fun person to be around. #LEFturn" — NASCAR Sprint Cup driver Clint Bowyer.

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"Praying for all of Jason Leffler family, especially his little guy Charlie." — IndyCar driver Ed Carpenter.

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"My thoughts and prayers are with Jason's family and friends. Breaks my heart thinking of his little boy." — NASCAR Sprint Cup driver Jeff Burton.

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"Sad to hear of Jason's tragic passing-thinking of his family and son Charlie. May he rest in peace!: — NASCAR Sprint Cup driver Ryan Newman.

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"Sitting here in disbelief.. All I can think about is Charlie.. Prayers to the Leffler family..." — NASCAR Nationwide driver Elliott Sadler.

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"Extremely sad to hear about Jason Leffler. spent a lot of time racing with him. Gone way too soon. Prayers to his entire family." — NASCAR Sprint Cup driver Joey Logano.

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"Another racer gone too soon. So sad, Our thoughts are with his family and friends." — NASCAR Sprint Cup driver Martin Truex Jr.

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"I'm completely devastated to hear about Jason Leffler. It doesn't seem real. Pray for his family tonight." — NASCAR Nationwide driver Trevor Bayne.

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"Life isn't fair, it doesn't give you an alert when it's ur time. That's why you gotta live life like it's your last day and do what you love!" — NASCAR Truck Series driver Darrell Wallace Jr.

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"Jason was a great representative of our brand & will always be a part of our family. Our hearts ache for his son, Charlie, and family." — Great Clips, Leffler's former sponsor.

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"So so sad to hear that Jason Leffler has passed. Good friend, once a teammate, always will be remembered. #LEFturn thinking of Charlie..." — NASCAR Truck Series driver James Buescher.

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"Every driver knows the risk when they strap in, but it still never seems fair when the worst happens.. #rip #LEFturn." — part-time NASCAR driver Ryan Truex.