Originally posted by Mr.Mxyzptlk
What has definitively killed The Hulk (any universe/timeline/etc. is applicable), was seen directly on-panel and can not be explained away as plot induced stupidity (i.e., a nuke going off in his front lobe wouldn't be PIS unless he has healing feats that would allow survival but the instance where The Punisher killed him with an arrow through the eye obviously is PIS)?
The fight he had with Zeus left him on death's bed his healing dropped to 7% of normal his heart stopped and had to be started again.He was still in a weaken state a couple of issues later.I would argue that if he was not rescued when he was and given medical attention he would have died.