Born and raised in Cork, Ireland, Walsh was raised in a Catholic household, and had no intention of becoming an actress, until she followed in the footsteps of her elder sister, who was also an actress, and young Eileen began to attend theatre workshops. Her first break came when, as a student, she landed the role of Runt in the stage version of Disco Pigs, which received rave reviews. Subsequent movies have included When Brendan Met Trudy, The Magdalene Sisters, and The End.
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Source: Wikipedia