Registration, The Sydney Mail and New South Wales Advertiser, 22 August 1874, p 245, http://nla.gov.au/nla.news-article162484739:

The undermentioned officiating ministers have been registered at this office for the Celebration of Marriages:—Roman Catholic Church (diocese of Armidale): The Rev. William O'Callaghan, Richmond River; the Rev. Michael Sheehan, Narrabri; the Rev. William Reade, Grafton; the Rev. Bernard Fitzpatrick, Armidale; the Rev. James Quish, Kempsey, Macleay River.

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To Builders, Clarence and Richmond Examiner and New England Advertiser, 1 September 1874, p 5, http://nla.gov.au/nla.news-article61899747:

Tenders will be received up to Tuesday, the 22nd September, for the erection of the Catholic Church, at Casino. Plans and specifications may be seen upon application to the Rev. W. O'Callaghan, Casino, to whom tenders are to be addressed on or before the above date.

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Melbourne. Sudden Death, The Corowa Free Press, 9 July 1886, p 2, http://nla.gov.au/nla.news-article234844589:

A very sudden death occurred this morning at the Niagara Hotel. The deceased was the Rev. W. O'Callaghan, a Catholic clergyman, late of Sandhurst, who was in delicate health. He attended at St. Francis' at seven o'clock and on returning complained of feeling ill, and expired before medical aid arrived. Deceased was about proceeding to the old country by the Sorata to-morrow for the benefit of his health.

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Intercolonial Items, The Sydney Morning Herald, 12 July 1886, p 4, http://nla.gov.au/nla.news-article13640471:

The Rev. W. O'Callaghan, a Roman Catholic priest, died suddenly at the Niagara Hotel, Lonsdale-street, Melbourne, last Thursday morning. He had assisted at 7 o'clock mass at St. Francis's Church, and on his return to the hotel, where he lodged, complained to the licensee of feeling unwell. The licensee told him to lie down on a couch, and sent for Dr. Bird ; but when the doctor arrived the priest was dead. He was on the eve of his departure for England for the benefit of his health. He was at Sandhurst for some time, and had been in ill-health. He was about 50 years of age.

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T.W. Campbell, The Priests of the Diocese of Armidale: A Necrology, Braddon ACT, 2005:
O'Callaghan, William F

Born in Co Kilkenny Ireland, 6 July 1820, place of birth unknown. Educational details unknown, but understood to have been a practising solicitor before studying for the priesthood. Where he studied unknown, although he entered the Society of Jesus (Jesuits) on 24 September 1846. Date and place of ordination unknown. The published obituary recorded that 'After practising his [legal] profession for a number of years he entered the Society of Jesus and became a distinguished professor of theology of his Order. After several years' residence in Ireland and England the deceased went to South America and held high positions in the Colleges there'. Jesuit records indicate he apparently left the Society in 1866/67. In 1874, recently arrived in New South Wales, he took responsibility for a portion of the northern rivers part of the Armidale diocese from Felix Schurr. He perhaps was at Tenterfield in 1876, then at Casino in 1877. In 1877 he went south to Melbourne and was appointed assistant priest Heidelberg. He then moved to Williamstown, Hotham and St Francis Melbourne. In 1881 he was attached to the Sandhurst diocese, based at the Bishop's House, Bendigo. He remained there until he died. He died in Melbourne on 8 July 1886, after returning to his hotel from his morning devotions at St Francis, Melbourne. He was staying in Melbourne preparatory to retiring permanently to Ireland on the Sorata, which sailed on 9 July 1886. He was buried in Melbourne general cemetery. The probate of his will revealed an estate valued at £3,400.
(Sources: Advocate 21 Jul 1877 p 6, 25 Jul 1874 p 12, 11 Aug 1877 p 6, 1 Feb 1879 p 7, 8 Mar 1879 p 6, 11 Jun 1881 p 8, 17 Jun 1886 p 18, 10 Jul 1886 p 11, 14 Aug 1886 p 19, FJ 15 Mar 1917 p 3, Kelly, Jesuit archives, Rome, MDHC A-Z O39).

(Reproduced by permission of Tom Campbell.)