The 6-foot-8-inch (2.03 m) O'Kelly, who made his international début in 1997 against New Zealand, became a talisman of the Irish side and was Ireland's all-time caps leader,[citation needed] surpassing Mike Gibson, on 12 February 2005 when he started in Ireland's Six Nations fixture against Scotland. O'Kelly not only earned his 70th cap, but scored Ireland's first try in the match, giving them a lead they never relinquished. O'Kelly has since been surpassed by Ronan O'Gara (128caps), Brian O'Driscoll (124 caps), John Hayes (105 caps) Johnny Sexton (99 caps), Peter Stringer (98 caps) and Donncha O'Callaghan (94 caps) but earned 92 test caps in his career.[3]
At the end of the 09/10 season, O'Kelly announced his retirement from professional rugby. He is the only player in the Heineken cup to have played since the start of the competition – 15 years. He has won a grand slam, the Heineken cup, the Magners League(3) and 4 Triple Crowns: he is also Ireland's third most capped second row. As well as that, he is a two time British and Irish Lion.