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FT LAUDERDALE (CBSMiami) – One of six men pulled from the water after their boat capsized off Ft. Lauderdale has died.

The group was fishing about two miles offshore when their boat began taking on water around 10:30 p.m. They were forced to bail out as the boat went under.

A nearby Tow Boat US raced to the rescue. As a Broward Sheriff’s helicopter hovered above shining a spotlight on the men, who had been treading water for 20 minutes, Captain Dominic Keenan and his mate started pulling them aboard.

“(Broward Sheriff) Air rescue did find four people which are vessel came and picked up. Three of the people that our captain picked up were alert, conscious, and knew what was going on,” said Cole Sisler, another captain with Tow Boat US.

The fourth man was unconscious so the captain immediately began CPR.

“We couldn’t find the vessel whatsover. The vessel completely sank. No one had life jackets on at the time,” said Sisler.

A second boat arrived and rescued the two men still in the water.

“Our job is to tow boats and help refloat boats, but in the end, it’s to help people. Everybody at one point or another has gone outside our line of what are job description is to help, to lend a hand. That’s what we do. That’s what we are here,” said Cole Sisler, another captain with Tow Boat US. “It keeps us going, to be out there, helping people, saving lives if we can.”

The Coast Guard arrived and one of their crew members took over the CPR on the unconcious man as they headed to shore. He was rushed to the hospital in extremely critical condition where he was pronounced dead.

It is unclear what caused the boat to sink.