The Court of Appeal in Belfast has ordered that Brian Shivers face a retrial for the murders of two British soldiers at Massereene barracks in 2009.
The same court had ruled that the convictions against Mr Shivers for the murders of sappers Mark Quinsey, 23, and Patrick Azimkar, 21, were unsafe.
After the Public Prosecution Service applied for a new trial for the 47-year-old from Magherafelt, Co Derry, the three appeal court judges said it was in the public interest for them to grant the request.
The judges also refused Mr Shivers' application for bail due to a risk of reoffending.
He was remanded back into custody to await the retrial, which is scheduled to begin on 4 March.
Sappers Quinsey and Azimkar were shot dead by the Real IRA as they collected pizza outside the barracks in Co Antrim.
Four others, including two pizza delivery men, were seriously injured in the attack.
Mr Shivers, who is terminally ill with cystic fibrosis, had been ordered to serve a minimum of 25 years in prison.
His lawyer Niall Murphy said yesterday's decision to quash his convictions was the right one.
