A Fort Myers man died while scuba diving off of Key Largo Sunday.
50-year-old Mark Matthiessen was diving in 30 feet of water at French Reef. Shortly after 10 Sunday morning he surfaced behind another dive boat.

Deputy Becky Heron with the Monroe County Sheriff’s office says when the captain of that boat, The Tropical Voyager, asked if Matthiessen was all right, he indicated he needed help.

“As Matthiessen was being assisted aboard, he collapsed and stopped breathing. Cardio Pulmonary Resuscitation was begun immediately and, after loading all their divers on board, the Tropical Voyager started back to shore, continuing with CPR. They were met at the dock by paramedics who pronounced him dead.”
Mark Matthiessen’s dive buddy said he never indicated he was having any problems during the dive. An autopsy will be done to determine the cause of his death.