Shelbourne finished the season on a disappointing note when going down 4-0 to Bohemians at Dalymount Park today.
Bohs captain Kevin Hunt got the opener for the home side after 30 minutes in a game that they dominated for long spells.
Top scorer Glen Crowe grabbed a brace with strikes on 54 and 68 minutes while Fergal Harkin wrapped up the rout 14 minutes from time.
Shels finished on top of the league at the end of the 33 games but the fight to see who will be champions is surely only beginning.
St Pat's would of course be champions had they not been been deducted 15 points after it was discovered that Charles Mbabazi Livingstone was improperly registered.
Pat Dolan's men had to come from behind to earn a 1-1 draw against Longford Town, who secured a place in the play-offs.
Longford opened the scoring after 53 minutes when Michael Holt scored a fantastic free-kick. Philip Hughes grabbed the equaliser on 80 minuntes to make the closing stages a nervous affair for Longford.
Longford's draw condemned Dundalk to the first division despite their 3-0 win away to Monaghan Town.
Shamrock Rovers strolled to a 3-0 victory over Galway United to leave them in second spot. But they could be affected by the outcome of any action by St Pat's.
Derry City secured a 1-0 victory over Cork City at the Brandywell thanks to a late goal from Liam Coyle while UCD and Bray Wanderers played out a 0-0 at Belfield.