There has and always will be speculation on who the shooters were. One thing is clear from later defectors in the Gambino crime family, that the shooters were in house, and that the consigliere to the Gambino crime family at the time Joe Biondo gave out the contract. Most say that he had the Armone brothers do it, but Joe Armone was in lockup at the time, with the possibility of Stefano as being one of the shooters, as he was still out on the streets.