Born in Kinnitty, County Offaly, Dempsey first arrived on the inter-county scene at the age of nineteen when he first linked up with the Offaly under-21 team.
Born in Kinnitty, County Offaly, Dempsey first played competitive hurling in his youth. He arrived on the inter-county scene at the age of nineteen when he first linked up with the Offaly under-21 team.