Eddie Flanagan, 49, was shot in the head at least once from a handgun at an apartment in Santry, north Dublin on Wednesday night.
A 51-year-old man, thought to be the owner of the apartment, presented himself to a Garda station at noon yesterday. He was arrested under firearms legislation and can be detained for up to a week.
Shortly afterwards, gardaí located a handgun close to the scene. This will now undergo fingerprint, DNA and ballistic tests.
The body of Mr Flanagan, from Macroom Road in Coolock, north Dublin, was kept overnight at the apartmen in The Green gated complex on Larch Hill before being removed at noon. A postmortem established that he died of gunshot wounds.
Gardaí were trying to unravel the circumstances surrounding the shooting. There were reports of a party at the apartment on the night.
Garda sources said the shooting appeared to be “drink induced” and may have been the result of a row or possibly an accident.
Gardaí said they were alerted when a gun blast was heard shortly after 10.30pm. When they arrived they found a man’s body in a third-floor apartment in one of the blocks.
There were reports that men were seen running from the apartment after the shooting. Gardaí were trying to locate the owner of the house when he walked into Coolock Garda Station.
Local resident David Stone said there had been a party in the building before Garda patrol cars and an ambulance arrived at the complex.
Homeowner Sinead Slevin said there is very little trouble in the 321-apartment complex.
“It’s a bit of a shock. There’s a bit of random trouble, like parties. It’s not a thing you expect to happen.”
* Gardaí are appealing for anyone who was in the general area of The Green between the hours of 7pm and 11pm to contact Santry Garda Station on 01 6664000.