On November 22, 1963, he was assassinated in Dallas. Vice President Lyndon B. Johnson assumed the presidency upon Kennedy's death. Marxist and former U.S. Marine Lee Harvey Oswald was arrested for the state crime, but he was shot and killed by Jack Ruby two days later. The FBI and the Warren Commission both concluded Oswald had acted alone in the assassination, but various groups contested the Warren Report and believed that Kennedy was the victim of a conspiracy. After Kennedy's death, Congress enacted many of his proposals, including the Civil Rights Act and the Revenue Act of 1964. Despite his truncated presidency, Kennedy ranks highly in polls of U.S. presidents with historians and the general public. His personal life has also been the focus of considerable sustained interest following public revelations in the 1970s of his chronic health ailments and extramarital affairs.