The 32-year-old was shot dead by a friend of his while they sipped pints in a pub in Inchicore, in Dublin’s south inner city, last Saturday.
Gardaí believe the drug dealer and snitch had so many enemies it was only a matter of time before he was going to die. “Griffin made enemies with everybody. He made enemies with the guards and criminal gangs, both north of the Liffey and south of the Liffey,” said a garda source.
Gardaí are also investigating the possibility that he was murdered on the orders of a republican, who was living with his girlfriend in Tallaght, west Dublin. It is understood Griffin had a heated row with the former IRA man and his girlfriend.
Gardaí are also investigating any links with the abduction of a man, who was a friend of Griffin’s, earlier on Saturday from Tallaght.
Michael Moran, 38, turned up at Cahir Garda Station, Co Tipperary, late on Sunday night and is currently being questioned by members of the National Bureau of Criminal Investigation.
When Griffin went to have a pint with his friend in the Horse & Jockey pub on Saturday he wore a bulletproof vest and carried a handgun.
But his friend pointed a gun to his head and pulled the trigger.