The former UFC Welterweight Champion last competed at UFC 135 in September 2011, the now retired fighter was knocked out by Josh Koscheck that night. White, who spoke to ESPN after hearing news of the accident, said that Hughes was driving a truck that collided with a train.
Hughes, 43, was a two-time All-American wrestler at Eastern Illinois before transitioning to mixed martial arts after college.
The UFC sent their prayers to Hughes and his family via their official Twitter account. St-Pierre got his revenge two years later at UFC 65, beating Hughes by TKO.
CBS Sports will update this story when more details are available.
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