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.
Greystones Mourns The Loss Of Beloved Adopted Son Johnny McEvoy
The Offaly-born balladeer, who made his home in Greystones and raised his family there, passed away peacefully at his home on Sunday.
Harris Stands By Dole Crackdown Amid Opposition Ridicule
Tánaiste says he is acting for working families, but critics say the target is tiny and the timing cynical
Greystones-Based Judge Helps Select Winner Of Amhrán Na Laoch For Irish Radio
East Coast FM among radio stations backing the competition which produced a winner from County Louth
Wicklow Football Boss Hails Departing Stalwart Mark Kenny
Ballymanus forward Mark Kenny retires from Wicklow duty as Oisin McConville freshens up his panel and backroom for a Sam Maguire tilt
Two Arrested After Greystones Gym Burglary
The pair are expected before Bray District Court today.
Light rain
High: 10°C | Low: 9°C
Light rain
High: 10°C | Low: 9°C
Heavy Rain
High: 9°C | Low: 8°C
Light rain
High: 9°C | Low: 8°C
Heavy Rain
High: 8°C | Low: 6°C
