Monroe County Sheriff's officials say 45-year-old Charles H. Boone of Quitman, Arkansas, fell unconscious when he got back aboard a rental boat after diving 112 feet (34 meters) off Islamorada on Tuesday afternoon.
People onboard the boat brought Boone to shore and he was taken to a hospital. He was then airlifted to a Miami hospital for treatment. He was pronounced dead later Tuesday.
Officials don't suspect foul play. Autopsy results are pending.
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