Sligo Rovers put back-to-back league victories togeher on Friday night with a 1-0 win over second-in-the-table Derry City at the Showgrounds.
Stefan Radosavljevic was Rovers matchwinner in the 84th minute, which capped a strong second-half performance by the home side.
Derry are now five points behind league leaders Shamrock Rovers, who were held to a scoreless draw at UCD.
That result means the students, who will have Donegal's William O'Connor as their head coach next season, are now relegated to the First Division.
Friday night's LOI Premier Division results
Sligo Rovers 1 Derry City 0
UCD 0 Shamrock Rovers 0 - UCD are relegated
St Pat's 3 Dundalk 1
Shelbourne 2 Cork City 1
Drogheda Utd 0 Bohemians 0.
First Division
Kerry FC 0 Galway Utd 4 - Galway are champions
Cobh Ramblers 5 Finn Harps 1
Longford Town 0 Waterford 3
Treaty Utd 4 Athlone Town 1
Wexford 2 Bray Wanderers 1
