The CIA was in contact with generals planning to remove Diem. They were told that the United States would not oppose such a move nor punish the generals by cutting off aid. President Diem was overthrown and executed, along with his brother, on 2 November 1963. When he was informed, Maxwell Taylor remembered that Kennedy "rushed from the room with a look of shock and dismay on his face." He had not approved Diem's murder. The U.S. ambassador to South Vietnam, Henry Cabot Lodge, invited the coup leaders to the embassy and congratulated them. Ambassador Lodge informed Kennedy that "the prospects now are for a shorter war Killed November 2, 1963 President Diem South Vietnam ordered by CIA Killed November 22, 1963 President Kennedy It's no coincidence these two presidents were BOTH assasinated 20 days apart! and in the 1970's UN resolution banned gov't ordered assasination of state leaders, go figure. IMO, the assasination of Diem was the cause of 50,000 dead US soldiers in the vietnam war. somebody made a bad mistake at the CIA.