It's a real good possibility Gambino had him shot but i'm not so sure that was Gambino's style to use a black guy as the shooter. Gambino could of set Colombo up many different ways where he could of been killed without doing it in public like that with all the press. Gambino was pissed with him though and arranged for a low turnout that day at Colombo's rally.

If i was betting on it i'd say Gallo had one of his black buddies from prison find this guy for the shooting and either lucked out that one of Colombo's guys killed him or arranged for him to be shot. My gut feeling is Gallo was the guy behind the shooting. But i have no real evidence so i'm just really guessing.