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Shocking CCTV shows the moment a convicted killer knocked a football fan unconscious in an unprovoked attack in a busy street.
Newcastle United fan Simon Walters was minding his own business outside a pub in Cardiff city centre when Robert Chambers, 30, walked up to him and punched him to the floor.
Unsuspecting Mr Walters, who was wearing his Newcastle shirt, was hit so hard by the "sickening blow" that he was knocked out and suffered whiplash.
The brutal attack happened outside The Cottage pub after a Premier League match between Cardiff City and Newcastle on August 18 last year.