The organisation that monitors paramilitary activity in Northern Ireland says it has no evidence linking the death of Paul Quinn to the IRA leadership.
The 21-year-old Co Armagh man received fatal injuries when he was beaten by a gang in a Co Monaghan shed last October.
He had been lured over the border from his Cullyhanna home and beaten by up to 12 men.
At public meetings, allegations have been made about Provisional IRA involvement in the murder.
In a report issued today, the Independent Monitoring Commission states that it is not attributing the killing to the IRA.
It says a number of people involved in the killing had been associated with the IRA at a local level, including members of the organisation.
It also says the killing was carried out by local people and arose from local disputes.
It notes that senior Sinn Féin members have condemned the killing and called for co-operation with the police.
Six months after his death there has been no evidence or confession to allow gardaí make arrests or charges.