"We are all shocked and saddened by the devastating and untimely loss of Kimbo Slice, a beloved member of the Bellator family," Bellator president Scott Coker said in a statement.
Slice, whose birth name was Kevin Ferguson, had been transported to a hospital earlier Monday near his home in south Florida, a Coral Springs Police Department sergeant told ESPN.
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The reason for his hospitalization was unclear and the cause of death was not immediately known.
The initial announcement of his death by the American Top Team MMA academy sparked a wave of reaction on social media.
"Kimbo was a charismatic, larger-than-life personality that transcended the sport," Coker said. "Outside of the cage he was a friendly, gentle giant and a devoted family man. His loss leaves us all with extremely heavy hearts."
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Born in the Bahamas on February 8, 1974, the heavyweight had a 5-2 professional record with four technical knockouts.
He last fought at Bellator 149 on February 19 in Houston.
His win over Dhafir "Dada 5000" Harris was later changed to a no-contest by the body that governs the sport in Texas after Slice tested positive for steroids.
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