(Newser) – Robert F. Kennedy Jr. is convinced that a lone gunman wasn't solely responsible for the assassination of his uncle, President John F. Kennedy. "The evidence at this point I think is very, very convincing that it was not a lone gunman," he told interviewer Charlie Rose in front of an audience at the Winspear Opera House in Dallas last night. He did, not, however, say what he believed may have happened. Rose asked whether he believed his father, the US attorney general at the time of his brother's death, felt "some sense of guilt because he thought there might have been a link between his very aggressive efforts against organized crime."

Kennedy replied: "I think that's true. He talked about that. He publicly supported the Warren Commission report but privately he was dismissive of it." In fact, his dad called it a "shoddy piece of craftsmanship." Kennedy said his father had investigators do research into the assassination and found that phone records of Lee Harvey Oswald and nightclub owner Jack Ruby, who killed Oswald two days after the president's assassination, "were like an inventory" of mafia leaders the government had been investigating. He said his father was "fairly convinced" that others were involved. This year marks the 50th anniversary of the assassination. (Read more John F. Kennedy stories.)

