Wheldon's car went airborne after hitting another car during Lap 12, then apparently caught part of the catch fence just outside of Turn 2.
IndyCar CEO Randy Bernard announced Wheldon's passing, saying, "IndyCar is very sad to announce that Dan Wheldon has passed away from unsurvivable injuries. Our thoughts and prayers are with his family today."
Wheldon won the Indianapolis 500 in 2005 and 2011.
