What I said was , '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.
In the case I investigated I too thought that the assailant should be charged with murder and maybe convicted of that or manslaughter, but as I said, the QC who reviewed the case decided that in Law, as in the Tomlinson case, there was not sufficient evidence to prove that the victim's heart attack was caused by the assault. I accepted the QC's decision. I do know of any reason why I would question the decision of, probably a QC, in the Tomlinson case. To be able to make an informed judgement (rather than 'lets just attack the police') one would need access to all the facts including the PM reports. To make any decision without that information is just a wild guess in the dark.
A warning, albeit from a non medical man, if one is over weight, smokes, has a 'drink problem' has a poor diet, has an unhealthy lifestyle and does no exercise, you are at a higher risk of a heart attack and should have a chat with your doctor. Logic, would seem to suggest, that physically fit people are less likely die if they are pushed over, fall over or face a stressful situation ( maybe like demonstrating in a riot).