Gary Convie
Eamon Fox
Mark 'Hannibal' Haddock has been arrested in connection with three murders two decades ago.
The 45-year-old is currently being questioned at Newbury police station in Berkshire by officers from the PSNI.
Haddock is being questioned about the murder of Sean McParland in north Belfast in 1994.
Sean McParland (55) was shot in north Belfast in 1994. He died a week later from his injuries.
Haddock is also being questioned in connection with the double murder of Gary Convie and Eamon Fox, who were also gunned down in 1994.
Armagh men Gary Convie (24) and Eamon Fox (44) were murdered by the UVF as they eat their lunch in a car park close to the building site they were working on.
A spokesperson from the PSNI said: "Today's arrest is part of Operation Stafford, an investigation into a series of murders and other serious crimes by the UVF in north Belfast."