GARDAI are appealing to the public to come forward if they witnessed any suspicious activity at a senior citizens' complex where a man was found dead in the early hours of Monday morning.
Superintendent Dave Taylor said that Gardai are treating the death of Thomas Horan (63), as a murder investigation following the results of a post-mortem examination.
Mr Horan's body was found at 4am on Monday morning and two people have been arrested today in connection with the investigation.
Supt Taylor said the post mortem showed that said he died as a result of internal injuries.
"This afternoon Gardai arrested a male aged 27 and a female aged 37 under the provisions of Section 4 of the Criminal Justice Act and they're currently detained at Donnybrook and Irishtown Garda stations.
"Gardai are appealing to any person or persons who may have seen any unusual or suspicious activity between 10pm on Sunday January 5 and 4am on Monday January 6 at Cambridge Court."
He said the dead man was separated from his wife and has been living in Ringsend for about four years.
He said: "Thomas was a quiet man, very well-respected by his neighbours and he enjoyed his music.
"Cambridge Court is an old folks' home and approximately 40 people live there.
"Thomas was a 63-year-old man, he was originally from Mullingar, he was separated who lived at the complex there.
"He was a very quiet, inoffensive man, very popular with his neighbours."
By Cormac McQuinn and Conor Feehan