I don't believe that Oswald did it alone. I just don't see the motive even though he was nuts...

Plus like was mentioned above, Jack Ruby didn't kill him out of love of his country and JFK. He was sent like Rocco was to kill Hyman Roth. It was either do it or you die a horrible death. I do think the mob was in on it, and possibly our own government as well. Too much cover up is why I think the government was in on it. Jack Ruby was a connected strip club owner (or ran one), so I just don't see why he thought he would go down and shoot Oswald because he was mad JFK was gone. He was involved with about every known crook that ran around that area including Marcello and Chicago as well. Wouldn't be surprised if the Dixie Mafia was not involved with him either.