`` An insecure North Korea could ( be ) more dangerous , '' a U.S. official says . South Korea 's national security council is convening , its president says . Kim died of a heart attack while on a train , North Korea 's state news agency reports . North Korea 's enigmatic leader Kim Jong Il -- who , after succeeding his father 17 years ago , captained his poor , closed nation and antagonized its enemies -- is dead , state media reported Monday . The United States has said it will not negotiate with the regime until there are full investigations into Kim's death and an end to human rights abuses in the country.
`` An insecure North Korea could ( be ) more dangerous , '' a U.S. official says . South Korea 's national security council is convening , its president says . Kim died of a heart attack while on a train , North Korea 's state news agency reports . The United States has said it will not negotiate with the regime until there are full investigations into Kim's death and an end to human rights abuses in the country.