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.
UCD Study To Lay Bare The Blight Of 'Sheep Worrying' Across Wicklow
There's hardly a sheep farmer in Wicklow who hasn't been affected according to expert
“A Secure Home In Time For Christmas” - Boost For Blessington With New Cost Rental Plans
28 new affordable rental homes are coming to Blessington
Man Due In Court After Back-To-Back Robberies In Bray
Wicklow Housing Growth Remains Strong
The latest Department of Housing figures reveal almost one thousand new homes were commenced throughout Wicklow in the first seven months of this year.
Emergency Road Closure at Cappagh Next Week
Traffic management and diversions will operate on Tuesday 25th & Wednesday 26th August.
6:00am - 8:00am
The Wicklow Way with Nikki Hayes
Sunny intervals
High: 18°C | Low: 12°C
Sunny intervals
High: 17°C | Low: 11°C
Sunny intervals
High: 19°C | Low: 9°C
Sunny intervals
High: 19°C | Low: 8°C
Sunny intervals
High: 20°C | Low: 8°C