I didnt try test all the deaths on sims 2 yet but one sim of mine died because he fainted (that happens when you energy bar is completely red ) 3 times then he died lol.
On this sims when the enregy bar is ompletely low the dont fall on te floor sleeping they faint.
Now one other case: Look at the pic its obviously by the cotext of the image that it represents weed but Maxis cant admit it ill post the original polemic thread link.
Image:
Here
Theread:
Here