Canon Peter Duffy, from County Monaghan, was an uncle of former Bishop of Clogher Joseph Duffy.
Police are still holding a fourth man, who was detained in County Monaghan on Thursday.
An laundering plant in Castleblaney, County Monaghan, had the capacity to launder 10m litres per year.
BBC: Major cross-border operation against illegal fuel trade
He was found dead at a friend's house in County Monaghan on New Year's Eve.
Mr McGovern was found dead in a house in County Monaghan later that day.
The production of burgers at a processing factory in County Monaghan is expected to resume shortly.
Ministers requested police assistance after equine DNA was found at Rangeland Foods, in County Monaghan.
His funeral is to take place at St Patrick's Church, Corracrin, in County Monaghan on Monday.
The tests were carried out following the discovery of horse meat in beefburgers produced in County Monaghan.
Police investigating the murder of County Monaghan teenager Jason McGovern in Omagh have arrested a fifth person.
Rangeland Foods in County Monaghan said that the burgers were made in September 2012 and used meat from Poland.
He was abused by Canon Peter Duffy, from County Monaghan, an uncle of the former Bishop of Clogher Dr Joseph Duffy.
Mr Quinn, 21, died after being beaten by nine men with iron bars at a farm shed in County Monaghan on Saturday.
BBC: NEWS | UK | Northern Ireland | Barn murder an evil deed - Brady
Large amounts of horsemeat were found in some burger samples manufactured at the Silvercrest plant in County Monaghan, which supplied Aldi Ireland.
Police have said they are treating an attack in Omagh that led to the death of a County Monaghan teenager as murder.
Dynes, 41, from Bree, Castleblayney, County Monaghan, was driving the vehicle and Cavlan, from Circular Road, Dungannon, County Tyrone, was sitting in the passenger seat.
The meat was processed at the Silvercrest plant in County Monaghan.
BBC: Horsemeat row: Trade union's fears over Silvercrest jobs
So far, only one person has been charged over the bombing, however, three men arrested earlier this week are still being questioned by police in County Monaghan.
After being attacked, Mr McGovern made his way to a friend's house in Mullan village near Emyvale in County Monaghan where he was found dead on Monday.
It is the families' case that Mr Murphy provided two phones used in the bombing operation while Mr Daly, from County Monaghan, used one of them during it.
Colm Murphy, from Dundalk, and Seamus Daly, from County Monaghan, are defending an action by relatives of some of the 29 people killed in the Real IRA attack.
Mr Murphy, a Dundalk-based contractor and publican, is being sued along with former employee Seamus Daly, from County Monaghan, over the atrocity that killed 29 people and injured hundreds more.
It says the burgers were supplied by Rangeland Foods in County Monaghan, which previously withdrew more than 9, 000 burgers made for the UK market after some were found to contain horsemeat.
The meat was processed at the Silvercrest plant in County Monaghan and the Irish authorities have said the horse offcuts were contained in a frozen block of filler product imported from Poland.
One supplier, meat processor Silvercrest, based in County Monaghan, Ireland, lost supply contracts with Tesco, Aldi and Co-operative supermarkets after the Food Safety Authority of Ireland (FSAI) found horse and pig DNA in burgers it supplied.
Last year, Gardai recovered the bodies of Eamon Molloy, left in a coffin in a graveyard in County Louth, and John McClory and Brian McKinney, whose remains were found after weeks of digging in County Monaghan.
The Irish Bog Snorkelling Championship takes place in the wonderful marshy boglands of Castleblayney, County Monaghan and you would be hard pressed to find a muddier, murkier and less inviting track in any other racing event.
The ABP Food Group - one of Europe's largest processors and suppliers - said that, as a result of new tests two days ago, "the responsible course of action is to suspend all production at the Silvercrest plant in County Monaghan with immediate effect".
Down's remaining NFL games will be against Kildare and Meath while the county's Ulster Championship opener is against either Armagh or Monaghan on 8 June.
Queen's Charlie Kielt will be in action against his county team-mates after starring in the 0-13 to 0-9 win over Monaghan, where Niall McKenna also impressed.
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