The incident happened off Wexford's Hook Head this evening.
The father of four in his forties was taking part in an underwater search for a fisherman who went missing from a trawler off the Saltee Islands yesterday morning.
The alert was raised shortly after noon today as he returned to the surface after a dive.
He was treated by colleagues at the scene and airlifted to University Hospital Waterford where he has since been pronounced dead.
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UPDATE: Stolen Dog Returned to Wicklow NSPCA Centre In Rathdrum
Footage released by the helped a member of the public spot her and alert Gardaí.
Fresh Flooding Fears & Wicklow Council Update - New Yellow Rain Alert Kicks In At Midnight
A Status Yellow rain warning has been issued for the East and South - even small additional rainfall could trigger flooding on already saturated ground.
7:00am - 11:00am
Bank Holiday Breakfast
Heavy rain shower
High: 8°C | Low: 2°C
Heavy rain shower
High: 8°C | Low: 2°C
Sunny intervals
High: 8°C | Low: 0°C
Heavy rain shower
High: 8°C | Low: -1°C
Light rain shower
High: 9°C | Low: -1°C