Hollywood actor Bruce Willis has warned former US President John F Kennedy's killers are still at large, insisting LEE HARVEY OSWALD did not act alone. Oswald was, according to four US government investigations, solely responsible for the 1963 assassination of Kennedy in Dallas. Oswald was shot dead two days after the murder on his way to Dallas County Jail. However, Willis insists it's likely that Oswald was made a scapegoat for the assassination, telling Vanity Fair, "They still haven't caught the guy that killed Kennedy. I'll get killed for saying this, but I'm pretty sure those guys are still in power, in some form. The entire government of the United States was co-opted. "I don't think my opinion means jack s**t, because I'm an actor. Why do actors think their opinions mean more because you act?"