It is being reported that the murder of Clive Staunton in Co. Kildare could be linked to a seizure of cigarettes in Dublin in recent weeks.
The 50-year-old was shot dead outside his home in Leixlip on Thursday night after returning home from a soccer match at the Aviva Stadium.
Gardaí are looking into links between his murder and the ongoing Hutch-Kinahan feud.
An inquiry is also now believed to be taking place into Mr Staunton's possible connections to a recent seizure of tobacco in Dublin Port.
Gardaí are appealing for information on a Volvo S40 car believed to be used in the killing which was later found in Co. Wicklow.