This is all over the Web but here is a link to the story if you haven't seen it. The chief engineer for the Camry hybrid died of a heart attack which was eventually ruled to be caused by overwork, poor guy.
For those unfamiliar with the Toyota method of product development, the chief engineer on the project is responsible for the ultimate success or failure of the effort and is under a lot of pressure. The moral of the story: stress can kill.
http://news.yahoo.com/s/ap/20080709/ap_on_bi_ge/japan_overwork_death