The BBC's Lucy Williamson says news of the death has taken people by surprise North Korean leader Kim Jong-il has died of a heart attack at the age of 69, state media have announced. Millions of North Koreans were "engulfed in indescribable sadness", the KCNA state news agency said, as people wept openly in Pyongyang. KNCA described one of his sons, Kim Jong-un, as the "great successor" whom North