By Lucia Binding, news reporter
A man stabbed a 21-year-old man to death in an act of "pitiless savagery" before going on the run for more than three years, a court has heard.
Shane O'Brien, 31, appeared at the Old Bailey on Monday at the start of his murder trial.
The court was told he slashed the neck of Josh Hanson following a short conversation in RE Bar, Hillingdon, west London, in October 2015.
The victim died at the scene following the "sudden and shocking" incident.
The pair had never met before their brief encounter in the bar, jurors were told.
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Mark Heywood QC, prosecuting, said: "For reasons that have yet to be fully explained, the defendant stood up and approached the other man.
"As they spoke briefly, with others around them, the defendant reached for his blade and with a single, slashing motion, he used it. He cut his throat.
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