Mahlon Reyes, a deckhand on one of the "Deadliest Catch" crab fishing boats, is dead ... TMZ has learned.
Mahlon's wife tells us he died in his hometown of Whitefish, Montana after he suffered a heart attack last Saturday morning. Although he survived it, and was transported to a hospital ... he never regained consciousness.
His wife says the family decided Sunday to take Mahlon off life support. She says he was surrounded by loved ones.
We're told he had no existing health conditions his family knew of, so they're all completely shocked by the massive heart attack.