It's actually not urban legend, but it does happen fairly often, at least in Korea. There was a guy a year ago who went through about the same thing, but he lasted longer. And a month or two ago a Korean couple left their infant child at home while they played WoW at an internet cafe and came home a few hours later to find the child dead.
http://today.reuters.co.uk/PrinterFr...OREA-GAMES.XML
Reuters article about this latest death.