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.
JP Nolan Return Boost For Wicklow Who Remain Unchanged For Tailteann Test At Croker
Wicklow stick with a winning side as Oisin McConville names unchanged team for Tailteann Cup semi-final against Offaly
CBS News Highlight Greystones' Efforts To Shield Children From Dangers Of Mobile Phones
CBS News has shone an international spotlight on Greystones after featuring local schools' pioneering efforts to protect children from the harmful effects of smartphones and social media. The report focused on the town's "It Takes a Village" initiative, which encourages parents to delay giving children smartphones and promotes healthier alternatives to screen time.
Uisce Eireann Issue Appeal With A Third Of Irish People Disengaged With Water Conservation
The appeal follows the warm spell in May when more than 680 million litres of water was used in the Dublin area alone in a single day
Wicklow Shoppers Urged To Check Ready Meals Following Recall
A number of Pettitt's Kitchen ready meals sold in local SuperValu stores are impacted.
Former Donard Health Centre Secured For Community Use
This boost for the village is an important step in supporting community life and rural sustainability in west Wicklow.
7:00am - 10:00am
Saturday Breakfast
Light rain
High: 19°C | Low: 12°C
Light rain
High: 18°C | Low: 12°C
Light rain
High: 18°C | Low: 11°C
Heavy rain shower
High: 20°C | Low: 10°C
Light rain
High: 19°C | Low: 10°C