Ruaidri Ó Gadhra, Chief of the Name, died 1285.
The Annals of the Four Masters record, sub anno 1285, "Rory O'Gara, Lord of Sliabh-Lugha, was slain by Mac Feorais Bermingham on Lough O'Gara." However by this stage the family had been exiled into Cul Ui Fionn (Coolavin, County Sligo).
References
Ruaidri Ó Gadhra Wikipedia(Text) CC BY-SA