Two people arrested in connection with the arrest of Wayne Whelan in Dublin have been released without charge.
The 42-year-old died after being shot a number of times at Mount Andrew Court in Lucan last November.
Gardaí arrested two people in connection with the killing this week.
A man in his 30s was arrested on Monday and taken to Lucan Garda Station.
A woman in her 30s was arrested yesterday and taken to Ronanstown Garda Station.
Both have now been released without charge with a file being prepared for the Director of Public Prosecution (DPP).