The Irish golfer finished 10 off the lead
Henrik Stenson is the BMW International Open champion.
The tournament's top player according to the world rankings finished 17-under par and three shots clear of the field.
Darren Fichardt and Thorbjorn Olesen finished in a tie for second on 14-under.
Ireland's Paul Dunne finished 7-under par after a final round 71.
The Greystones golfer finished tied 13th overall as a result after consistent rounds of 69, 71, 70 and 71 over the four days.