Jason Charles Leffler was an American professional open-wheel and stock car racing driver. Leffler began racing in the open-wheel ranks, competing in the 2000 Indianapolis 500 before moving to primarily NASCAR competition. He died from injuries sustained in a 410 sprint car race at Bridgeport Speedway in Bridgeport, New Jersey.

The 84th Indianapolis 500 was held at the Indianapolis Motor Speedway in Speedway, Indiana on Sunday, May 28, 2000. The race was sanctioned by the Indy Racing League, and was part of the 2000 Indy Racing Northern Lights Series season. After four years of an ongoing organizational dispute and "split" in Indy car racing, Chip Ganassi Racing became the first major CART-based team to compete at the race since 1995. The Ganassi team of Jimmy Vasser and Juan Pablo Montoya competed as a one-off entry, and were well received by fans and fellow competitors. Both drivers were quickly up to speed with the IRL regulars, and were expected to be favorites in both qualifying and on race day. Also making a heralded return to Indianapolis was two-time winner Al Unser Jr. who had switched full-time to the IRL in 2000.