A fourth person is now being questioned by gardaí in connection with the fatal shooting of Mr Raymond Salinger in Dublin city centre pub in January.
The man was arrested after 2 p.m. and is being held at Kilmainham Garda Station.
Three other people, two men and a woman, are still being questioned at Kevin Street and Kilmainham Garda Stations.
Mr Salinger (40), was shot as he drank with friends in Farrell's pub on New Street, in the south inner-city area, between 9.45 and 9.50 p.m. on January 28th.
