The identity of the man is not yet known.
One man has drowned off the coast of Kerry on Friday afternoon.
A Valentia Coast Guard chopper, Flight 115, was directed to the scene in the Cromane area following reports that a man was seen floating in the water in Castlemaine Harbour.
It's understood that the man was brought to the shore and treated by paramedics, but was pronounced dead at the scene.
It’s believed the man’s boat may have overturned after he suffered a heart attack while out at sea.
A Garda investigation into the incident is being carried out.
