Well the fact that he's dead at all following the use of the Dragon Balls in the Cell Saga is a mistake by Toriyama. However for the rest of the series it stuck and as a result whenever we see King Kai post Cell he's still dead. Therefore my vote is on him still being dead: most likely hanging around Other World with the likes of Goku and company.
On another note while I still love this series all the recent talk of plot holes, mistakes and inconsistancies is really starting to make me notice how poorly written DB really was/is at times (seriously Mr. Toriyama......having King Kai teach ALL the martial artists on Earth the Kaio Ken during DBO?)
Speaking of Dragon Ball Online the game saw it's beta release in Taiwan and is free to play. The good news is that this makes it possible to play without having to resort to idenity theft. The bad news is that it's in Chinese, takes a long ass time to set up and that the unofficial English patch doesn't translate a whole hell of a lot :-/
Still looks to be pretty fun however![]()