A boxing fan is on trial for killing a man with a single punch that made the victim's 'skull rotate rapidly on his spine'.

Brandon Sillence was drinking at The Waverley pub in Bangor, North Wales, in September last year when he allegedly attacked 'without provocation'.

The 25-year-old used his fists to deliver the fatal blow to the unsuspecting Dean Skillin, 20, which resulted in him 'being brain dead before he hit the ground'.