[AnnieK]

It is possible to have minor heart attacks and not know about it. One of my parents friends recently passed away after massive heart attack and when they did the PM they discovered he had aged scarring on his heart and had probably had one or more mild heart attacks in the months or years leading up to the big one (he had never seen his doctor or complained of any pains in his chest that his wife was aware of). Each one would have weakened his heart more and so its possible that Kellie could have had one and it only showed up after the episode with finding the boxer. Obviously after any health scare its only natural to be more cautious with things I guess.