Michael Tormey (49) was gunned down in the driveway of his home on Thomond Road in Ballyfermot in the early hours of yesterday morning.
The victim has been described as a "family man" who had no known links to criminality.
Gardaí are following several lines of inquiry, including whether Mr Tormey had been involved in a personal row which got out of control and led to the murder.
Detectives have established that he was at a social gathering on Saturday night before his body was discovered after 5am on Sunday.
No arrests have yet been made and gardaí have not yet recovered the firearm used in the first gun murder of 2022.
At this stage of the inquiry, gardaí say they have no obvious motive for the killing and believe it occurred sometime between 3.30am and 5.30am.
The scene of the killing at Thomond Road was sealed off yesterday morning to facilitate a technical examination.
Mr Tormey has been described as a "family man" and "great friend" who had no known links to criminality.
It is understood his wife and two children were inside the property at the time of the murder.
Local People Before Profit councillor Hazel de Nortúin, who knew Mr Tormey, paid tribute to him, saying: "He was a very decent man, a family-orientated man and he was a great friend to those who knew him.
"I never heard a bad word about him from the time I knew him, this is a tragedy.
"He only got married in 2019 and my condolences go to his wife and children.
"The community is completely shocked.
"I really want to extend my condolences to those who knew him and the community of Ballyfermot."
Another friend posted an online tribute to Mr Tormey, describing him as "a complete gentleman and family man, a hard worker, a good provider and a truly beautiful soul".
Gardaí are appealing for anyone with information in relation to the shooting contact them.
As part of their investigation yesterday, they reviewed CCTV footage and made door-to-door enquiries.
Mr Tormey's remains were removed from the scene before midday yesterday and taken to the city morgue for a post-mortem examination.
Locals in the area have expressed their shock at the murder, with public representatives calling for anyone with information to contact gardaí.
Fianna Fáil councillor Daithí de Róiste said his thoughts were with the Tormey family.
"I am saddened to hear of a fatal shooting on Thomond Road this morning," he said.
"My thoughts and prayers go to the family at this time.
"I am calling on anybody who saw anything relating to this tragedy, or who may have any information about what happened, to please contact the gardaí."
Sinn Féin councillor Daithí Doolan, said: "The community is in total shock, he appeared to be a normal family man and neighbour and he was shot at five o'clock this morning.
"Ballyfermot has suffered way too much violence and violent crime at this stage and it's time that the gardaí and the minister for justice got a grip on it.
"They need to prioritise policing resources for Ballyfermot. We keep hearing that resources aren't an issue.
"Well now is a time to redeploy resources to this community that has suffered from too much violence in recent years, and tackling gun crime must become a priority for this government.
"It is literally costing lives and any time there is a gun crime like this or a fatal shooting, it sends tremors right through the community."