I was watching or reading once, can't quite remember where but there was this test. A swab that you put in your mouth that gives you a ph reading for you body and depending on your ph, determines whether you have stopped growing and have started dying.
I wonder, is there a "death" cell in our genes that determines when we die?
I haven't heard that, but I have seen a study that showed the weight of a person dropped (on average) by about 800 grams just after death. The question that was asked as a result was, "does the spirit/soul have a measurable weight?"