Gardaí have arrested two men and a woman in relation to the murder of Wayne Whelan.
42-year-old Whelan was shot in the head before his body was left in a burning car in Lucan on Monday, November 18.
Because of the fire, investigators had to take DNA samples to positively identify the remains.
Both males are being detained under the provisions of section 50 of the Criminal Justice Act, 2007, while the female is detained under the provisions of section 30 of the Offences Against the State Act, 1939.
All three are currently being detained at Dublin Garda Stations.