Moment Britain’s most wanted man Shane O’Brien slashes drinker’s neck open in bar before calmly walking out and going on run for three and a half years

THIS is the moment Britain's most wanted man Shane O'Brien slashes a man's neck open in a bloody public murder in a West London bar. The chilling footage, released at the request of his victim's family today, shows O'Brien calmly walking out of the bar as blood pours from Josh Hanson's neck – before going…

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