Gardaí say this latest suspect is being held at a Garda station in west Dublin.
A third arrest has been made in connection with the death of a man at a restaurant in West Dublin on Christmas eve.
Tristan Sherry died during a botched shooting after he walked into Browne's Steakhouse on the main street in Blanchardstown on Christmas eve and shot a man.
He was then tackled and stabbed as he tried to escape.
He was pronounced dead at the scene.
Last Saturday, 22-year-old Michael Andrecut, with an address at Sheephill Avenue in Dublin 15, was charged with his murder.
Yesterday Gardaí detained a second person in connection with Mr. Sherry's death.
He is still being questioned.
Now a third arrest has been made.
Gardaí say this latest suspect is being held at a Garda station in west Dublin.

Motorcyclist Dies After Road Collision In Lucan
Cost Of Over €76K To Deport Six Male Convicts To Nigeria
Cabinet To Approve €2BN Funding For Uisce Éireann
€1.95M Worth Of Drugs And Over €140,000 In Cash Seized At Dublin Port
Irish Music Month Confirmed For September 2026
Jordanian Authorities Set To Decide On Whether To Release Person Of Interest In Jamey Carney Murder Case
Armagh Healthcare Worker Sentenced After She Filmed And Mocked Dementia Patients