Question...in order to die of heart failure, don't you actually have to have a heart in the first place?
All kidding aside, the next few days are going to be critical ones; we know absolutely zilch about who's going to succeed Kim(reports about his son notwithstanding) and there's a 50-50 chance the new guy could turn out to be even more deranged than Kim was. Marxist dictatorships have a disturbing tendency to not only breed power-mad lunatics but to be very coy about who replaces those lunatics as head of state.