Who was married to the woman known as Jackie O until his assassination in 1963?
Jackie O (disambiguation) Jackie O often refers to Jacqueline Onassis. It may also refer to:
William Greer William Robert Greer (September 22, 1909 – February 23, 1985) was an agent of the U.S. Secret Service, best known for having driven President John F. Kennedy's presidential limousine in the motorcade through Dealey Plaza in Dallas on November 22, 1963, when the president was assassinated.