I hope he wasnt on hardcore mode

No, I'm sorry, that doesn't get a feel. It's just a case of human idiocy. Putting the wants before the needs. He'd have been fine if he'd ate something or drank something but no he just sat there and allowed himself to die because he had clearly formed some type of addiction to Diablo.
Now all that's left is to wait and see if the Taiwanese government sues Blizzard because their game can potentially kill people. And yes, some governments are actually dumb enough to blame the game instead of the player.

I didn't get a feel either, just thought others might.

And yup, blizzards about to be knee deep in lawsuits and shit.

they aren't to fault for anything that happens to anybody because of their own idiocy.

We know they aren't at fault, but trust me, there will be lawsuits. The country will blame the developer rather than the gamer. I'll give you an example similar to this. After the death of Ayrton Senna (Formula 1 driver) the team he had been employed at was charged with Manslaughter by the Italian Government. Now Ayrton had died in a car crash on track, this was completely out of the hands of the team and was nothing more than a freak and tragic accident, but still the government blamed the team because they had made the car he was driving. In the same way that the Taiwanese Government will blame the game and developers for the death instead of the player.

"How DARE those cunts make a quality video game designed for entertainment. And how can they even consider telling people to take breaks? Thats bullshit, lets sue them."

As retarded as it is, that will honestly be their case. They'll demand that the game shuts off for 5 minutes every half hour to allow the player to rest and if they don't see this in a future patch/update then they'll ban Blizzards games in Taiwan.