She was best known for playing the role of irascible shopkeeper Mary O’Leary on the hit Channel 4 comedy Father Ted.
“Rynagh trained in the Abbey School of Acting and first appeared on our stages in 1969.
O’Grady also appeared in films including 1992’s Far and Away, alongside Tom Cruise and Nicole Kidman, The Commitments, and Breakfast On Pluto.
In Father Ted, Mary was known for her acidic arguments with her husband John (Patrick Drury), which stood in sharp comedic contrast to her sunny tone when talking to customers.