I just lost my dad to a heart attack, age 66, the other day. From what I know, he had come in from the garage with his wheelchair; he came in, went to the toilet, and then suddenly, BAM! as he was seated on the toilet to do his thing, he slumped forward and died right there.
I know I shouldn't make jokes about it, but I do admit it is one hell of a way to go. It seems so surreal when you think about it. It almost makes me seem to be obsessive about it, but I know that he's at peace with the Almighty.