A 23-year-old man has been arrested along with a a 32-year-old woman arrested,
The PSNI also carried out a search connected to the murder and an ongoing loyalist feud in the Trailcock Road area.
Both have been taken to the serious crime suite at Musgrave PSNI station for questioning.
Geordie Gilmore snr was shot in the neck and upper body while he was in driving his White Vauxhall Insignia car along Pinewood Avenue car at 2.15 pm last Monday, March 13.
He died in hospital on Tuesday.