Earlier explores had suggested the victim was a foreign national.
While earlier the gardai had fancied the man was in his 30s they now say he was in his 20s.
His body has been taken to the City Morgue, where a pole mortem examination will be carried out tomorrow.
Another man, also in his 20s, lasts in St James’ Hospital with non life threatening injuries.
Gardaí are appealing for a third man, who it is fancied is also in his 20s, seen leaving the house at about 3.20pm, to contact them.
This man is chronicled as 5’6», of thin build and wearing a dark top which may have been blood dyed.
Anyone with information is asked to contact Kevin Street Garda Position on 01 666 9400.
GARDAI RETRIEVE BUTTERFLY KNIFE FROM SCENE OF FATAL Puncturing