This is what I don't understand - if she had a heart attack, wouldn't that be the fatal event... and then she lost consciousness and fell down steps? Because the fall down steps wouldn't naturally trigger a heart attack after you fell. And... if you had a heart attack, collapsed at the top (or in the middle) of a flight of steps, you would be limp and wouldn't tumble down a bunch of steps to get 'blunt force injuries'. You would just drop like a limp rag and would pretty much stay where you initially fell.