New information about Sirhan Sirhan, the Palestinian man serving a life sentence for the murder of Robert F. Kennedy, has been released as the US National Archives unveils thousands of pages of records related to the assassination. The motive for the killing was revealed in a note written by Sirhan, who expressed his desire to dispose of the senator like his brother was five years prior. The attack occurred after Sirhan pledged allegiance to communist Russia and China, but he admitted that it was motivated by the Israeli-Palestinian conflict. Kennedy was targeted for his support during Israel's Six-Day War in 1967.