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KEY LARGO (CBSMiami) – The exact cause of death remains unknown for a Canadian tourist who died shortly after a 38-foot dive at reef offshore of Key Largo.

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James Leek, 58, was on a dive vessel called “Visibility.” The vessel came into John Pennekamp State Park shortly after 3 p.m. with CPR already in progress, according to Monroe County Sheriff’s Office.

Paramedics took over at the dock and transported Leek to Mariner’s Hospital where he was pronounced dead.

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Deputy Jean Gonzalez, the captain of the vessel, said they were diving at French Reef. The dive, which reached depths of 38-feet, was about a half hour long.

Leek was with a dive instructor. The two surfaced, and Leek appeared to be fine, but when they reached the boat’s ladder, Leek became unresponsive. That’s when they began CPR and brought him to shore.

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An autopsy will be done to determine the cause of his death.