 Muldoon contributed 3–24 (33) of Derry's total of 7–92 (113) in the 2004 All-Ireland Championship, including a goal in the semi-final and 1-06 (9) in the quarter-final in a man of the match performance against Westmeath.He was named full forward on the 2004 All-Star team for his performances the Championship.Muldoon had an injury called patellar tendinitis in both his knees.