He was a corner forward and has played at senior level for the Mayo county team, Connacht provincial team in the Railway Cup and club football for Shrule-Glencorrib in County Mayo and later with Dublin club Parnells.
In 2006, Mortimer was the top scorer in the All-Ireland Senior Football Championship[4] (1-32) as Mayo took the Connacht title, came from behind to beat Dublin in the semi-final but were ultimately thrashed by Kerry in the 2006 All-Ireland Senior Football Championship Final.
[6] A Mortimerless Mayo went on to reach the 2012 All-Ireland Senior Football Championship Final, which they lost to Donegal.
[citation needed] Mortimer infamously paid to tribute to music icon Michael Jackson shortly after his death in the 2009 Connacht Final.
He raised his jersey to reveal a T-shirt which read the words 'RIP Micheal [sic] Jackson' after scoring Mayo's second goal to earn a one-point win.