1955 Indianapolis 500

Bill Vukovich was killed in a chain-reaction crash while holding a 17-second lead on the 57th lap of this1955 Indianapolis 500 race. He was exiting the second turn, trailing three slower cars -driven by Rodger Ward, Al Keller, and Johnny Boyd- when Ward's car swerved as the result of a gust of wind. Keller, swerving into the infield to avoid Ward, lost control and slid back onto the track, striking Boyd's car and pushing it into Vukovich's path. Vukovich's car struck Boyd's, became airborne, and landed upside down after going over the outside backstretch retaining wall and somersaulting four-and-a-half times, bursting into flames. As the car burned Ed Elisian stopped his undamaged car and raced towards Vukovich in an attempt to save him. It did not matter; Vukovich had perished instantly.

William 'Bill' Vukovich was the second defending Indy 500 champion to die during the race, following Floyd Roberts in 1939, and the only former winner to have been killed while leading. Roberts' car was also thrown over the backstretch fence after exiting the second turn in his fatal accident. Since the 1955 race was counted as part of the Formula One World Championship, Vukovich is also the first driver to be killed during a World Championship race.