 Only nine days after the end of the Reims event, Lefebvre was killed in a crash at Juvisy, when the plane he was testing dropped to the ground from a height of twenty feet.In doing so, he became the first person to die while piloting a powered airplane, and the second person to be killed in an airplane crash.Lefebvre is a distant relative of the later film actress Capucine (1928-1990).