Gerard Burnett (28) was stabbed multiple times in a frenzied knife attack outside his partner Denise Farrell Daly's home at Castlecurragh Vale in Mulhuddart in August.
In response to the killing, his associate -- who has also been the victim of knife attacks -- went "on the rampage" in the Fortlawn estate on October 29.
Sources say that he is suspected of shooting up a house in the estate before being chased by a number of men.
These men then caught up with the man and gave him a "severe hiding" before fleeing on foot.
A source said: "Burnett's close associate was clearly pumped up and off his head, but he got more than he bargained for when he targeted that house.
"He ended up needing hospital treatment after getting a severe hiding."
The incidents unfolded shortly before midnight on Monday October 29.
Before his murder, Gerard Burnett was known to gardai for burglary offences and car crime, but was not a gangland figure. However he did have almost 100 previous convictions.
Mr Burnett had lived at Dromheath Avenue in Mulhuddart up to a couple of months before his death.
At a court hearing in March 2011, Burnett was given a suspended prison sentence when he admitted drunken driving and using a stolen vehicle.
In 2006, he was jailed for three months after he committed nine crimes in the space of nine months, including twice trying to steal from a garda station.
After Mr Burnett's murder, his heartbroken partner Denise said: "We did everything together. He would tell me if he was feeling dodgy about anything.
"I will have to just look after my child. My dad was stabbed when I was 11 and now he has to go through all of this."
Mr Burnett's cousin Anthony (31) was killed in a savage double murder with his pal Joseph Redmond (25) in Dundalk, Co Louth, in March.
The chief suspects for carrying out the gruesome murders in Dundalk are Dublin criminals who work for 'Mr Big' -- the Coolock gang boss who is suspected of ordering the murder of Real IRA gang boss Alan Ryan in September.