The midlanders were on level terms heading into the last quarter of Saturday's game.
It was a heartbreaking end to the season for Athlone Town over the weekend.
Dario Castelo's side suffered a 3-1 defeat in the second leg of the League of Ireland First Division to Waterford on Saturday.
17-year-old Republic of Ireland Under 18 International Romeo Akachukwu came off the bench to net a second half hat-trick to send the Munster side to the playoff final this weekend.
Frantz Pierrot scored Town's only goal from the penalty spot.
The season is now finished for the men's team.