Gardaí suspect the motive for the murder of a man found dead in a flat in Dublin's north inner city could be drug-related.
The victim has been named as Tony Dempsey of New Road in Inchicore in Dublin.
The body of the 28-year-old was in the flat for more than a week before it was discovered.
His family say they are "broken-hearted" and have called his death "cruel".
The Peter McVerry Trust, which manages the property, said its staff visited the flat as part of its work supporting vulnerable people but did not see any indication that a body was there.
Gardaí have already interviewed a number of people as part of their investigation into Mr Dempsey's murder, but they have also to formally interview a number of others.
His body was found in a flat in Kevin Barry House in Dublin’s north inner city on Monday evening. He had been attacked and suffered severe head injuries.
It is understood Mr Dempsey's body had been in the flat for over a week while people came and went, and lived there.
A number of people were in the flat when gardaí arrived and more subsequently called while they were there.
The property at Kevin Barry House was managed by the trust which said its staff visited the flat in recent days and while they were concerned by strangers, they did not see anything to indicate there was a body there.
Neighbours said the flat operated as a so-called "drug den" but the Peter McVerry Trust said it was not aware of this claim.
Mr Dempsey’s family have paid tribute to him on social media saying they are "broken-hearted" by his loss. They have also asked "why is life so cruel".
Tony Dempsey was known to gardaí, had served time in prison and had more than 48 criminal convictions including 22 for road traffic offences, and others for theft, drugs, criminal damage and possession of knives and firearms. A court was told eight years ago that he had "an horrifically chaotic" childhood.
He was also known to the Peter McVerry Trust but was not currently a service user.
