When a character who has low hit points from a fight dies after losing constitution from a disease, how do you tell which is responsible of death?
Example: Lets take a character who has ghoul fever. The said character normally has a constitution of 12, and has a maximum of 9 hit points. He gets into a heavy fight which drops him to 1hp/9. Afterwards, his con. score falls from 12 to 9, because of the ghoul fever. His hit points are now at -1/7, and he subsequently dies (correct me if I'm wrong).
Was the cause of death ghoul fever, meaning that he rises later as ghoul, or is it the wounds he got during the fight, meaning he doesn't?