Luciano N. Grifoni is one of the five heads of the Italian Mafia dons targeted to die by Carl Elias and the only one who is still alive. (“Flesh and Blood”) After being the only survivor of Elias attack, he goes into witness protection.
He later gets in Elias' good graces and helps set an ambush for Lionel Fusco and another HR cop named Bowman, killing the latter. He then tells Fusco to pass the message to HR that Elias is through with them. (“C.O.D.”)