The police officer cleared of killing Ian Tomlinson will be sacked after being found guilty of gross misconduct at a disciplinary hearing dismissed by the newspaper seller's family as a "whitewash".
A Metropolitan Police disciplinary panel, sitting in public for the first time, dismissed Pc Simon Harwood for breaking rules relating to professional standards.
The 45-year-old hit Mr Tomlinson with a baton and shoved him to the ground on the fringes of the G20 protests in April 2009.
Father-of-nine Mr Tomlinson, who was moving away from police lines at the time, managed to walk 75 yards before he collapsed, and later died from internal injuries.
Chairman of the panel Commander Julian Bennett said of Harwood: "His actions have discredited the police service and undermined public confidence in it.
"He has accepted it will be impossible for him to ever again serve as a police officer. We agree, as we consider it inconceivable that he could ever hold a role within the police service again."
Mr Bennett said Harwood was dismissed with immediate effect.
James Lewis QC, for the Metropolitan Police, told the hearing Harwood's behaviour was "utterly unacceptable for the police service and completely justifies his immediate dismissal".
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