Scot Alexander Breithaupt, who organized bicycle races on dirt motorcycle courses in the early 1970s, becoming a founder of BMX and later a champion and one of the sport's best known figures, died in California, authorities said Monday. He was 57.

"Scot was one of the key figures in making BMX become what it is today. He would say he was the key figure, because that was the kind of guy he was," said Craig Barrette, spokesman for USA BMX, which runs the sport's Hall of Fame, where Breithaupt is enshrined. "He was involved in every aspect of BMX."

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