Gardaí have said they are no longer treating the death of Karl Holmes in Tallaght yesterday as murder but as a case of violent disorder.
The post mortem carried out today showed the 44-year-old had ongoing health issues and died of a heart attack.
Gardaí are continuing to investigate the row involving around six people, during which a samurai sword was produced.
It is believed to have started around 5.30pm after one of the men on open ground at Avonbeg Gardens became angry with a child cycling a bicycle there.
Mr Holmes arrived at the scene in a car but collapsed a short time later.
He died an hour later in hospital.
Mr Holmes had a number of criminal convictions for a variety of offences, including breach of the peace and public order.
Six years ago he was sentenced to a year in prison for defrauding the revenue of over €50,000 as part of a construction scam run by professional criminals.
He was also jailed for five years in 1994 for grievous bodily harm.
Any witnesses to the incident and anyone who was in the Avonbeg Gardens area between 4.30pm and 6pm on Thursday 3 September is asked to contact Tallaght Garda Station on 01-666-6000, the Garda Confidential Line on 1800-666-111, or any garda station.