I think Jerome Johnson did shoot Colombo. But that begs the question, who put Johnson up to it? I think everyone involved, the NYPD, the FBI, Gallo, the other bosses, they all had something to gain by Colombo's death. I doubt anyone outside his blood family gave a shit. Whoever ordered the hit, they really covered their tracks by using someone like Johnson. And being in front of police practically guaranteed Johnson wouldn't live to tell the tale. It's anybody's guess who he was working for. But I have to think that if it was Colombo Family business, the FBI would have found evidence of it. They had Greg Scarpa in their pocket at the time.