you really like that bowels thing huh...
Even people undergoing surgery don't crap themselves. In order for that to happen you have to be in really bad shape. And since the paramedics found him unresponsive (which I take to mean not even any eye reflex) and without a pulse, it's a pretty reasonable marker as to when he died.
Why are you so anxious to cover for armed government agents who calmly, slowly killed an unarmed, prone civilian in handcuffs in front of witnesses, in public and on video, in broad daylight?