GARDAI investigating the killing in Finglas of 29-year-old Vincent Maher in the early hours of Saturday morning have released two men.
Father-of-one Mr Maher (29) was beaten to death at his apartment in Wellmount Road after a row over broken furniture.
Gardai believe the victim was attacked after he confronted two men.
"The scene that gardai came across on Saturday morning was a very bloody one with a lot of broken glass – there had clearly been a bad row in the apartment," said a source.
"It was obvious enough that Mr Maher had received a very bad beating. In particular, he had sustained some serious cuts to his head."
The investigation into his death has not yet been upgraded to murder
Gardai are awaiting the results of toxicology tests to determine if the amount of alcohol and drugs in the victim's system played a role in his death.
Detectives said it was possible he would have survived if an ambulance had been called.
Men were seen running from the apartment some time after 5am.
Mr Maher's body was found beside his bed by the landlady who visited the flat at about 11am.
The two men in their 20s arrested in connection with Mr Maher's death had been detained at Finglas garda station but were released last night without charge.
A file on the case is being sent to the DPP.
Mr Maher was separated from his partner, and his seven-year-old daughter was a regular visitor to his home in the Springmount apartments complex.
Gardai are continuing to appeal to anyone who may have attended a party in the apartment between 8pm on Friday and 7am on Saturday to come forward.
They would also like to speak to any taxi drivers who may have dropped off or collected passengers at the location.