|Reference style||The Most Reverend|
|Spoken style||Your Grace|
Priest and bishop
He held this position until 1976, when he was appointed Bishop of Galway and Kilmacduagh and apostolic administrator of Kilfenora. While in Galway, Casey was seen as a progressive. It was a significant change in a diocese that had been led for nearly forty years by the very conservative Michael Browne (Bishop from 1937 to 1976).
Casey was highly influential in the Irish Catholic hierarchy, and served as bishop until his resignation in 1992. He was a friend and colleague of another highly prominent Irish priest, Father Michael Cleary. Although they both represented a liberal trend in the Church, they continued to support doctrine for priestly celibacy, and against pre-marital sex, abortion, and similar issues.
Casey was well known for his work aiding Irish emigrants in Britain. In addition, he supported the Dunnes Stores' staff, who were locked out from 1982 to 1986 for refusing to sell goods from apartheid South Africa.
US foreign policy
Casey attended the funeral of the murdered Archbishop of San Salvador, Monsignor Oscar Romero. He witnessed first hand the massacre of those attending the funeral by government forces. He then became a vocal opponent of United States foreign policy in Central America, and, as a result, opposed the 1984 visit of United States President Ronald Reagan to Ireland, refusing to meet him when he came to Galway.
In 1992, newspapers discovered that Casey had had a sexual relationship with Annie Murphy, an American divorcée. Together they had a son, Peter, born in 1974 in Dublin. Murphy later claimed that, during the pregnancy, Casey had attempted to persuade her to give the child up for adoption at birth. She chose not to do so and raised him with the help of her parents. When Murphy decided to go public about the relationship and informed The Irish Times, Casey tendered his resignation and left the country. She later published a book, Forbidden Fruit, in 1993 revealing details of their relationship.
Casey resigned and his action is regarded as a pivotal moment when the Roman Catholic hierarchy began to lose its considerable influence over the society and politics of Ireland. He was succeeded by his Secretary, Bishop James McLoughlin, who served in the post until his own retirement on 3 July 2005.
Casey was forced to embrace the life of a foreign missionary in South America. He worked with members of the Missionary Society of St. James in a rural parish in Ecuador, despite his lack of knowledge of the Spanish language. During this time, he would travel long distances to reach the widely scattered members of his parish. After his missionary period was completed, instead of returning to Ireland, Casey was forced to work in a parish in England. He returned to Ireland in 2006.
In August 2011, Casey was admitted to a nursing home in County Clare because he was in poor health. He had stated in an interview in May 2010: "My memory is gone badly for a long, long time. I got four mini strokes in my brain about eight years ago. They told me - they were very blunt - they said 'You've had four mini strokes on your brain'. I said 'What does that mean?' 'You're on your way to Alzheimer's or a stroke.' And I said 'What can I do?' 'Very little,' they said."
- History of Bishop Casey
- Casey admitted to nursing home Irish Examiner, 2011-08-31.
- Bishop Casey attends launch of book about Trocaire Irish Times (via Highbeam), 2010-05-07.
- Annie Murphy, Peter de Rosa; Forbidden Fruit: the true story of my secret love for the Bishop of Galway (1993); ISBN 978-0-316-90573-2