A Scotland Yard riot squad officer filmed knocking Ian Tomlinson to the ground will be told today if he faces prosecution over his death.
The officer, a member of the force's territorial support group, was caught on camera pushing the newspaper seller to the ground in the G20 protest clash.
Mr Tomlinson (47), died from internal bleeding after collapsing a short distance away in the City of London last year.
The officer, who remains suspended from duty, could be charged with manslaughter, assault or misconduct.
No British police officer is thought to have ever been convicted for manslaughter while on duty. The maximum penalty is life imprisonment.
Police told his widow and nine children he died of a heart attack after being caught up in the protests. But the footage showed Mr Tomlinson being hit by a baton and shoved to the ground by an officer .
The first inquest said he died of natural causes, the second of internal bleeding. Results of the third were not made public.