Greg Long, 21, from Cork, was visiting the Costa del Sol resort of Torremolinos, Spain when he drowned in a swimming pool hours into his first family holiday abroad.
It is understood that Mr Long fell into the pool just hours after checking-in to the hotel where he was staying.
A hotel worker is said to have pulled him out of the water with the help of a receptionist after diving in to rescue him.
Upon reaching the scene, paramedics tried to revive him but there was nothing they could do to save him.
Mr Long was travelling with around 15 family and friends and was in Spain to celebrate a 40th birthday.
Police are investigating the circumstances of the death but witnesses said everything pointed towards a tragic accident where Mr Long fell into the deep end of the pool and couldn’t get out.
A spokesman for the local emergency services said: “We received the first call at two minutes before 7pm from a man who said a youngster was in a bad way after falling into a swimming pool.
“We mobilised the paramedics and local and national police. We subsequently got a call from the medical professionals who attended the scene to say that the person in question had died.”
It is understood that Mr Long’s mother, Trish, is being comforted by family and friends still in Spain, while his brother, Mark, and sister, Aisling, are being supported back home in Rylane.
Mr Long was a keen sportsman and had been part of Cork’s Gaelic football development squad.
He played for Aghabullogue GAA club, who described him as a “great sports star”.