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KEY LARGO (CBSMiami/NSF) – A woman visiting from Austin, Texas died while snorkeling off Key Largo.

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Cheri Crozier, 58, and her husband were on a snorkeling trip Tuesday afternoon on board the vessel Encounter, out of John Pennekamp State Park. He said she began having issues about 1:15 p.m., so they moved to more shallow water, about three to five feet deep. She told him she wanted to return to the boat.

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As they tried to return to the boat, she began to have difficulty swimming so they yelled for help. Employees on the boat threw them a rope and towed her back to the boat.

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Once on board, she became unconscious and unresponsive, then stopped breathing. A doctor who was on board began to perform CPR as the boat returned to shore. Crozier was taken to Mariner’s Hospital where she was pronounced dead.