A man arrested in connection with the investigation of the murder of David Douglas in July is expected to appear in court on Monday.
GardaĆ arrested the man, in his 30s, in connection with the investigation in North County Dublin on Tuesday afternoon.
He was being questioned at Kilmainham Garda Station about the murder of David Douglas who was shot dead on Bridgefoot Street, Dublin 8 on July 1, 2016.
Mr Douglas was approached by a man who fired a number of gunshots that killed him while he was standing on Bridgefoot Street.