Eight days after the assassination of President Kennedy, on November 30, 1963, Ruth Paine inadvertently discovered evidence that Lee Oswald had attempted to assassinate General Edwin Walker. Among the letters that Ruth Paine repeatedly sent to Marina was a thick book of household advice in Russian. The book contained an undated note left by Lee for Marina on April 10, 1963 (the day of the Walker assassination attempt) which Marina would later testify she had concealed. Before the Kennedy assassination, Dallas police had no suspects in the Walker shooting.