A Democrat, Kennedy represented Massachusetts in the U.S. House of Representatives and Senate prior to becoming president. On November 22, 1963, he was assassinated in Dallas, Texas. 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. Young John attended the Riverdale Country School−a private school for boys−from 5th to 7th grade, and was a member of Boy Scout Troop 2 in Bronxville, New York. In September 1930, Kennedy, then 13 years old, attended the Canterbury School in New Milford, Connecticut, for 8th grade. In April 1931, he had an appendectomy, after which he withdrew from Canterbury and recuperated at home.