Pope Leo XIV appointed Archbishop Francis Duffy of Tuam, Ireland, as the new bishop of Killala, thus uniting the two dioceses in persona episcopi (in the person of the bishop). Following the 2024 retirement of Bishop John Fleming of Killala, Archbishop Duffy had served as the diocese’s apostolic administrator.
In February 2025, Pope Francis united two other Irish dioceses, Achonry and Elphin, in persona episcopi.