Mann was the first driver to be killed in a NASCAR Grand National race; he died from a pulmonary hemorrhage caused by a crash at Langhorne Speedway.
On the 211th lap, he crashed through a fence at the track, thereby flipping his Hudson Hornet.
After being rushed to Nazareth Hospital in nearby Philadelphia, he died in the evening of a pulmonary hemorrhage and massive head wounds.
[2] Mann had been defying a superstition among NASCAR drivers by painting his vehicle green.
[3] Mann would become the first of three drivers to be killed at Langhorne within five years; Frank Arford and John McVitty also perished while racing at the track in 1953 and 1956, respectively.