Presidency of John F. Kennedy killed Oswald due to his own grief over Kennedy's death, but the assassination of Kennedy and the death of Oswald gave rise to enormous speculation that Kennedy had been the victim of a conspiracy. Kennedy was succeeded as president by Lyndon Johnson, who stated on November 27 that "no memorial or oration or eulogy could more eloquently honor President Kennedy's memory than the earliest possible passage of a civil rights bill for which he fought so long." President Johnson created the Warren Commission—chaired by Chief Justice Earl Warren—to investigate the assassination. The Warren Commission concluded that Oswald acted alone in
John F. Kennedy assassination conspiracy theories indicated there was complicity on the part of Johnson include Jim Marrs, Ralph D. Thomas, J. Gary Shaw, Larry Harris, Walt Brown, Noel Twyman, Barr McClellan, Craig Zirbel, Phillip F. Nelson, and Madeleine Brown. The fact that JFK was seriously considering dropping Johnson from the ticket in favor of NC Governor Terry Sanford should Kennedy run in 1964 has been cited as a possible motive for Johnson's complicity in the assassination. In 1968, Kennedy's personal secretary Evelyn Lincoln wrote in her book, ""Kennedy and Johnson"" that President Kennedy had told her that Lyndon B. Johnson would be replaced as Vice