Police have launched a murder probe following the incident in Bar Uno, in Inverness Street.
Ambulance crews and police tried to save the 24-year-old victim, but he died from his injuries at the scene.
It happened close to midnight
Three men and one teenager were arrested over the incident and are being held in custody while police search for a motive.
Call police with information on 020 8358 0200. Alternatively, call Crimestoppers anonymously on 0800 555 111.
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