Gardaí investigating the deaths of Michael Cronin and James Maloney have released without charge the final man being detained at Store Street Garda Station.
Four of the five other people arrested in relation to the murder investigation were released earlier last night.
A file will be prepared for The Director of Public Prosecutions.
Mr Cronin and Mr Moloney were shot in Summerhill in Dublin on 7 January.
The two were shot in a car as they waited at the junction of Summerhill Road and Langrishe Place.
It is believed that both men were shot in the head by a gunman who was sitting in the back seat of the car.
