Career
Born in Tynagh, County, Killeen first excelled at hurling in his youth. He was a key member and later captain of the Portumna Community School senior team At club level he plays with Tynagh-Abbey-Duniry.
Killeen made his debut on the inter-county scene at the age of fifteen when he first linked up with the minor team
An All-Ireland medallist in this grade, he later joined the under-21 side. Killeen made his senior championship debut during the 2014 championship.
