via Twitter

Kasey Kahne @kaseykahne
Jason & I flew together this past weekend to Pocono. We talked sprint cars, cup cars and Charlie Dean. He loved racing & he loved his son!

Bobby Labonte @Bobby_Labonte
Lost a good guy tonight in Jason Leffler. Prayers with your family! .

Landon Cassill said: “Had a great talk with him just the other day. We reminded each other why we love racing and do what we do. He was family.’’

Kyle Larson said: “Such sad news tonight. Leffler was a great person and even better dad. I am glad I got to know him. Rest in peace.’’

Brad Keselowski @keselowski
Really sad for Jason Leffler and his family.
Thinking about his little boy… 😕😓

Ryan Truex @Ryan_Truex
Every driver knows the risk when they strap in, but it still never seems fair when the worst happens.. #rip #LEFturn

Juan Pablo Montoya @jpmontoya
Nuestras condolencias para la familia de #RIPJasonLeffler y especialmente su hijo!

Juan Pablo Montoya @jpmontoya
Thoughts and prayers for Jason Leffler and his family.

Martin Truex Jr. @MartinTruexJr56
Another racer gone too soon. So sad, Our thoughts are with his family and friends.

Aric Almirola @aric_almirola
Absolutely crushed when I think of little Charlie Leffler tonight. Godspeed Jason Leffler!

Kyle Busch @KyleBusch
Deeply saddened by the passing of @JasonLeffler tonight. Please keep his family in your thoughts and prayers. #LEFturn

Joey Logano @joeylogano
Extremely sad to hear about @JasonLeffler. spent a lot of time racing with him. Gone way too soon. Prayers to his entire family.

Trevor Bayne @Tbayne21
I’m completely devastated to hear a bout Jason Leffler. It doesn’t seem real. Pray for his family tonight