The 21-year-old, from Cullyhanna, was found at a farmhouse outside Castleblaney just after 6pm yesterday evening.
He later died in hospital in Drogheda.
His family has said he was recently involved with in a dispute with individual members of the IRA and told to leave the country.
It is believed he was lured to farm outhouses at Tullycoora near the village of Oram yesterday afternoon by a phone call from friends who were already there.
It is understood they were forced to make the call.
When the victim arrived, he was separated from the others, taken to an outhouse at the rear of the site and savagely beaten with crowbars and other implements by a gang of around seven to eight people.
He sustained a number of broken bones.
He was still conscious when gardaí arrived at the scene shortly after 6pm but died two hours later at Our Lady of Lourdes Hospital in Drogheda.
Two men, who it is believed were also assaulted at the outhouses later arrived at Daisyhill Hospital in Newry for treatment.
The scene remains sealed off as garda forensic experts continue to search the area for clues.
The death is expected to become a murder investigation tomorrow when the post mortem examination is carried out.
