Also CNN.
http://www.cnn.com/2011/12/18/world/asia/north-korea-leader-dead/?hpt=hp_t1 'Kim died due to overwork after dedicating his life to the people.' [North Korea state TV] More likely ate himself to death.
Kim Jong-Un, the third son, is the presumed successor, but some think that his brother-in-law Chang Sung-Taek will act as regent due to the younger Kim's dead-obvious incompetence at ruling anything at all and his significant progress in following in his father's footsteps by eating and fucking himself into early dementia and a not-premature-enough grave.
The eldest son, Kim Jong-Nam, is said to have no interest in politics; he also made a spectacle of himself by trying to sneak into Japan on a false passport so he could go to Tokyo Disneyland.