The death has taken place of well-known sports journalist and broadcaster Seán Óg Ó Ceallacháin.
He was 89 years old.
Following success representing Dublin on the county hurling team, he began his media career in the Irish Press.
Mr Ó Ceallacháin also presented one of the longest running sports results programmes in the world.
He signed off on his last Gaelic Sports Results programme on RTÉ Radio 1 in 2011, having joined his father on air in 1948.
His first broadcast on Radio Éireann was in 1935 as part of the Scoil Colmchille school choir.
Mr Ó Ceallacháin is survived by his son, two daughters and their families.
Paying tribute, President Michael D Higgins said: "I have just learned with sadness of the death of Seán Óg Ó Ceallacháin.
"He will be remembered as one of the finest GAA broadcasters of his generation and also as a highly respected journalist and author.
"As a bi-lingual broadcaster and writer he made an outstanding contribution to the use of our native language in sports commentary.
"Different generations will remember his familiar voice on the Sunday night radio programme on RTÉ radio, during which he presented all of the days gaelic sports results, with such passion and clarity.
"As an athlete himself, he excelled as a gaelic footballer and hurler both at club and county level and will be remembered as one of the finest all round contributors to the GAA over many decades."
RTÉ Director-General Noel Curran also paid tribute to the late broadcaster.
"Seán Óg Ó Ceallacháin was a legend in sports broadcasting," he said.
"His passing will be acknowledged by the many thousands of listeners for whom Sean Óg's Sunday night broadcasts were an essential part of our sporting Sundays."