According to the Beijing News, a teenager was recently hospitalized by another, who set him on fire with gasoline, claiming later to have 'transformed into a Fire Mage' a la World of Warcraft. The author of the referring article has it right: had this occurred in America, Blizzard would have been sued by the victim's parents. Apparently the legal mechanisms for doing this are not (yet) in place in China, so this did not occur.
This is an old, old topic, but since it's come up, I'll throw my 2 cp in. I've always thought it odd that whenever something like this occurs (which is all too frequently), parents and the media are so quick to demonize videogames, yet this behavior has been around since the dawn of mankind itself. Violence in movies is so much more pervasive and visceral than anything you could possibly see in a game, yet movie scenes are very rarely cited as the source of antisocial behavior.