Tyrone howler Damian Casey, 29, was attending a friend’s wedding when he died in an incident at a swimming pool.
The Dungannon man has played for Eoghan Ruadh GAA club and at inter-county level for Tyrone senior hurling team.
He is considered one of the best pitchers in the county.
County Tyrone Chairman Michael Kerr said: ‘This breaking news is incredible.
“Someone who brought honor, fun and simple, straightforward joy to our entire county, and far beyond, is gone and it’s so hard to comprehend.
“Very difficult days lie ahead for Sean, Susan, Louise and Catherine, for Damian’s extended family circle and many friends and associates, for his teammates and for the Gaels of Dungannon and Tyrone.
“Our deepest sympathy goes out to them, and our focus must now be on providing the support and comfort that will be so sorely needed.
“Damian Casey was a special gift to Tyrone and to hurling. We were the richest in his presence and the poorest in his passing.
Mr Casey scored 14 points for Tyrone in the Nickey Rackard Cup final last month at Croke Park in Dublin, claiming victory over Roscommon.
The University of Ulster Gaelic Academy tweeted: “We are deeply saddened to learn of the tragic passing of Damian, esteemed UU graduate and Fitzgibbon pitcher.
“We express our deepest sympathy and offer our sincere condolences to the entire family circle at this very sad time.”
The Gaelic Players Association tweeted: “Players across Ireland are devastated for Damian Casey’s family and friends and for all at Dungannon Hurling Club and Tyrone GAA.
“Damian stood out as a person and a leader. In the field, he was a magician of rare skill. He was one of us. He was among the best of us.
Sinn Fein Stormont leader Michelle O’Neill tweeted: “The community of Dungannon is heartbroken to learn of the tragic death of fantastic bowler Damian Casey.
“Thinking of his devastated parents and sisters, his family and friends, his teammates and everyone who loved him.