Hartnett first appeared on the inter-county scene for Kerry as a member of the minor team in 1981. He never played with the under-21 team, however, he made his senior team during the 1984–85 league. Hartnett made his only championship appearance when he lined out at full-back in a Munster semi-final defeat of Limerick in 1989.[2]
Management career
In retirement from playing, Hartnett became involved in team management and coaching. He was part of the Dr. Croke's management team when they won the Kerry SFC title in 2000.[3][4]