Two men, aged 21 and 25, are due to appear before court in the morning charged in relation to the death of Dale Creighton (20).
The third male, aged 18, who was detained has been released without charge this evening.
Another young man, Ross Callery aged 20, has also been charged in connection with the New Year attack on the young man who has since died from his injuries.
Ross Callery was charged with violent disorder in relation to the incident in Tallaght in the early hours of Wednesday.
College student James Reid is accused of producing a knife during the course of a dispute.
Detectives alleged that Callery and Reid were captured on CCTV footage at St Dominic's Road around 4am on New Year's Day when Dale Creighton was badly assaulted.
Reid's solicitor, Kevin Tunney, told the court his client "left the scene early", and this was accepted by gardai.
Mr Creighton was on life support and died in Beaumont Hospital on Thursday as a result of head injuries.
Two other people, Graham Palmer (24), of Homelawn Road, and Aisling Burke (20), of Bolbrook Grove, both in Tallaght, appeared in court earlier this week charged with violent disorder.
Judge John O'Neill remanded Callery and Reid on cash bail to appear before the court again on January 16. He also ordered them not to associate with each other or their co-accused.
Callery, of Westpark in Tallaght, appeared before Dublin District Court charged with violent disorder at St Dominic's Road in Tallaght.
Reid, of Homelawn Avenue in Tallaght, is charged with production of a knife during the course of a dispute.
Gardai objected to bail for the men, citing the seriousness of the charges.