The "Dorset", from Sydney, South Australian Register, 24 January 1844, p 2, http://nla.gov.au/nla.news-article73840809:

[...] Among the passengers by the Dorset we observe the names of [...] the Rev. Mr Mahoney, Mr Benson's successor, [...]

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Died, Morning Chronicle, Sydney, 26 April 1845, p 3, http://nla.gov.au/nla.news-article31745240:
At Maitland, on Thursday evening last, of apoplexy, the Rev. Edmund Mahoney, deeply and universally regretted by all who had the pleasure of his acquaintance. In him his congregation have lost an amiable and virtuous pastor, and the poor a kind and indulgent benefactor.--Requiescat in pace.

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Death, Maitland Mercury and Hunter River General Advertiser, 26 Apr 1845, p 2, http://nla.gov.au/nla.news-article673210:
We regret to announce the decease, on Thursday night last, of the Rev. T.[sic] Mahony, the Roman Catholic Minister of East Maitland. The deceased gentleman ruptured a blood vessel on Saturday last, and, notwithstanding the best medical attendance, he sank gradually until he expired. The reverend gentleman was much esteemed and respected by all who knew him.

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Died, South Australian Register, Adelaide, 21 June 1845, p 2, http://nla.gov.au/nla.news-article73842630:

On the 29th May last, at East Maitland, New South Wales, the Very Reverend Edmund Mahoney, Catholic Clergyman, after a short illness, occasioned by the bursting of a blood-vessel in the lungs. The decease succeeded the Rev. W. Benson in this colony, and during his residence here won the esteem and regard of his flock, by whom he will be much regretted.

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Original Correspondence, Maitland Mercury and Hunter River General Advertiser, 3 May 1845, p 3, http://nla.gov.au/nla.news-article673285:
To the Editors of the Maitland Mercury.
Gentlemen--So unexpected was the summons which called away from an affectionate and improving people their beloved and zealous Pastor, that till now their only panegyric was the solemn silence of heartfelt grief. Your kind notice in last Saturday's Mercury of the Rev. Mr. Mahony's decease elicited their grateful acknowledgments, and induces them to request the insertion of the following tribute to his memory.
In July, 1838, the Rev. Edmund Mahony arrived in this colony, and within a few weeks received his appointment for Maitland. The generous sacrifice which he had made, in bidding adieu to parents, country, and friends, he still continued by his unceasing cares and anxieties for the spiritual and temporal happiness of his flock. With heroic fortitude he denied himself even the moderate use of those liquors, which (although to him innoxious, nay perhaps at times useful and necessary) he considered the cause of misery, degradation, and ruin to his people; and many now live to bless him, as being, in the hand of Providence, the instrument of their regeneration.
He was not many months returned from Adelaide, where his piety, virtues, and zeal endeared him to persons of every denomination. At two o'clock on Sunday morning, the 20th April, he burst a blood-vessel. Spiritual and medical assistance and comfort were promptly rendered, and so favorable a change took place, that the physicians entertained hopes of his recovery, but a second rupture about half past five o'clock on the evening of the 24th terminated his earthly career, and destroyed the fond confidence of his Suffering friends. He remained in the church, at East Maitland, till Sunday, the 27th April, when his Grace the Archbishop, assisted by the Rev. Messrs. McEncroe, Lynch, and Dowling, performed his obsequies; and in a vault, erected by his people, repose his mortal remains. His people take this opportunity of expressing their full sense of the courteous and humane feelings which prompted the attendance at his interment of so many, who, whilst they did not kneel at the same altar, came to shed a tear over his estimable qualities and worth.
I remain, gentlemen, your most obedient servant,
HIS FRIEND.
Maitland, May 1, 1845.

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Patrick Francis Cardinal Moran, History of the Catholic Church in Australasia, 1895, p 204:
Monseigneur John Lynch, who was himself one of the party, when preaching in Parramatta in July, 1883, thus commemorated the life and labours of five of those distinguished priests, who had already been summoned to their reward:-"The beloved and eloquent Dr. Murphy, first Bishop of Adelaide, after endearing himself to the Catholics of Sydney as Vicar-General, died in the odour of sanctity. Dean O'Reilly founded the mission of Bathurst, now a flourishing diocese; Dean Mahony was my colleague in Maitland, and the memory of his zeal and labours is still fresh among the people who loved and revered him. I was at his bedside when in 1845 he rendered up his pure soul into the hands of his Creator.
(p 230) The Australian Church in 1841...
9.--East Maitland, in charge of Rev. Edmund Mahony, included Williams' River, fifty miles distant, Cooly Camp, sixty miles, and Dungog eighty miles. There was a Gothic church at Maitland, where the total number of Catholics was 600. About 450 assisted at Mass, and there were 30 monthly communicants. ...
(p 238) 4.-Maitland East and West. The priests are Rev. Edmund Mahony and Rev. John Lynch. In West Maitland, a temporary church has been erected, which henceforth must serve for a school. The foundations have been laid of another church of stone to be dedicated to St. John the Baptist. In East Maitland the Church of St. Joseph is nearly finished. In the district, there are already two chapels, besides the foundations of a third, and preparations are being made for commencing two more. There are 16 fixed stations in the district, besides several other occasional ones. Two schools have been opened, but, in East and West Maitland, the population is too scattered to allow the opening of a school. Here, as in every other part of the colony, several families have settled, who have sufficient means to engage and pay teachers for their children.
(p 334) A small stone church was erected in East Maitland as early as 1840, and it soon became remarkable for the number of converts who were there received into the saving fold. An interesting ceremony is recorded as having taken place on Sunday, the 5th of November, 1843. Nine adult converts on that day publicly renounced heresy, and were added to the Church. They advanced in processional order from the sacristy, and, entering the church by the front door, proceeded towards the altar bearing lighted candles in their hands, and knelt at the altar-rail. The Veni Creator and the Miserere were then chanted followed by the Profession of Faith. Great crowds assembled on the occasion, and, with joy and edification, assisted at the solemn ceremony. Father Mahony was at this time the pastor of East Maitland, but, in 1845, his loving flock had to mourn his premature demise. I find it also recorded that Christmas Day in 1843 was kept with great solemnity in St. John's, West Maitland, under the guidance of its pastor, the Rev. J. T. Lynch. Two hundred persons approached Holy Communion, some of them being converts who for the first time had the consolation of receiving the Blessed Eucharist.
(pp 510-511) Already in the month of January, 1844, with the Archbishop's approval, he had sent the Rev. Edmund Mahony to attend to the wants of the faithful in Adelaide pending his own arrival. This worthy priest was a native of Cork, and had studied in Maynooth College. In 1838, though not as yet ordained, he offered himself for the Australian mission, and accompanied Dr. Murphy to Sydney, setting out from England on St. Patrick's Day, and arriving at Port Jackson on the 15th of July, 1838. Soon after his arrival he was ordained priest in St. Mary's Cathedral, and was subsequently stationed at Maitland where he gave proof of ardent zeal and untiring energy. On the 10th of January, 1844, he set out for Adelaide where, though in failing health, he continued to labour throughout the year, returning to Sydney on the 9th of February, 1845. His return to Maitland was hailed with delight by the faithful of that district, but too soon he was to be summoned to his reward. He died in Maitland on the 24th of April following at the early age of 33 years. It is recorded of him that in Adelaide "by his mild and urbane demeanour, his charitable disposition, and indefatigable exertions for the spiritual welfare of the Catholics of the colony, he won for himself golden opinions from all sorts of men."