The getaway car used in the murder of Vincent Ryan two days ago was stolen in Co Kildare last year.
The 25-year-old was shot dead on McKee Road in Finglas in Dublin last Monday after he had dropped off his partner and five-month-old baby.
The gunmen escaped in a silver Volkswagen Golf - registration 07-KE-10213 - which was taken during a burglary at Cluaindara, Derrinstown in Kildare on 13 October last.
Detectives at Finglas are trying to establish where the car was kept until it was found burned out at Red Lane, Naas last Monday evening.
Gardaí do not believe the murder of the dissident republican is connected to the murder of David Byrne at the Regency Hotel in Dublin last month.
Vincent Ryan was charged but acquitted before the Special Criminal Court with possession of guns linked to the fatal shooting of Dublin criminal Michael Kelly, but remained a suspect for the murder.
His murder is believed to be connected to the ongoing feud between dissidents and criminals in Dublin which led to the murder of his brother Alan Ryan three-and-a-half years ago.