About 25 years ago I investigated the death of a man who had been punched by another. The man died of a heart attack. As it happens the man who died was a very big guy, grossly over weight and unfit (rather like it would appear the man in this case) and the one who hit him much smaller. The big man died of a heart attack.
I submitted the paper to our prosecution dept and was told that as the man died of natural causes, a heart attack, we could only charge the assailant with causing actual bodily harm.
Just because it was a police officer who pushed this guy, does not change the law, albeit that possibly those more cynically minded of 'us' would like it to be different !
