He died in his hometown of Whitefish, MT after suffering a heart attack on Saturday morning, his wife told TMZ.
Mahlon survived the attack after being rushed to hospital, but never regained consciousness and his family decided to remove him from the life support system.
His death was a huge shock to those close to him as he had no known health problems, his wife said.
She revealed that her Deadliest Catch crew will scatter some of her ashes at sea.
Mahlon worked on two Deadliest Catch boats: the Seabrooke and the Cape Caution.
Discovery Channel follows crab fishermen aboard fishing boats in the Bering Sea during the king crab and Alaskan snow crab seasons.
Its title comes from the high risk of injury or death associated with this trade.
It has been operating for 16 seasons.
TMZ reports that Mahlon was recently recovering from a torn Achilles tendon, which he suffered while crabbing on the boat.
He had worked hard to get back to Alaska for another crabbing season.
The Flathead County Sheriff’s Office says his official cause of death has not been determined.
Autopsy and toxicology results are pending.
Mahlon is survived by his wife and four children.