Four people have been arrested by detectives investigating the UVF murder of 55-year-old Sean McParland.
Mr McParland was shot in Skegoneill Avenue in north Belfast on February 17, 1994 while babysitting.
He died a week later in hospital.
Three suspects, aged 40, 47 and 51, were arrested in the north of the city yesterday morning.
They were questioned at the Serious Crime Suite in Antrim police station.
A number of properties were also searched in north Belfast. The fourth suspect, who is 42, was arrested in Co Antrim yesterday afternoon.
The 47-year-old suspect is also being questioned about the murders of Gary Convie and Eamon Fox in May 1994.
Mr Convie (24) and Mr Fox (44) were sitting in their car at a building site in North Queen Street on May 17, 1994 when a UVF terrorist opened fire with a sub-machine-gun. A PSNI spokesman said the arrests were part of Operation Stafford, an investigation into a series of murders and other serious crimes by the UVF in north Belfast.
High-profile Belfast loyalist and police informer Mark Haddock has already been "reported for prosecution" over three sectarian murders.
The 45-year-old was arrested in England in April by detectives investigating the 1994 killings by the UVF.