http://www.bbc.co.uk/news/uk-13519281
Probability of conviction for manslaughter, slim.
The problem is that the first pathologist said it was a heart attack, if it was, then it's no crime, you cant kill someone by natural causes.
Although the other Pathologist/s say otherwise the jury must be satisfied beyond all reasonable doubt that the guy died of an injury and not a heart attack.
A conflict of opinion by the pathologists I think must amount to reasonable doubt as to the cause of death. Thus the unlawful act of pushing him would amount to Actual Bodily Harm at the very most.
Whilst I would not change places with the PC I still think he will get off/ be found not guilty of manslaughter.
I think any discipline action will be delayed until after the criminal trial.
The finding of the jury at the Coroners Court has no bearing on any subsequent trail.