A teenager was killed "in the blink of an eye" when he was stabbed in the neck at a New Year's Eve event, a court has heard.
Harry Pitman, 16, was fatally attacked in Primrose Hill park , north London, just before midnight on 31 December 2023, after he gathered with friends to watch fireworks.
He was allegedly killed by 18-year-old Areece Lloyd-Hall as "revelry turned to tragedy", prosecutor Jocelyn Ledward KC said.
Opening Lloyd-Hall's Old Bailey retrial on Tuesday, Ms Ledward said Harry was stabbed in the neck once and "died almost immediately as a result of that single but deadly injury".
She said Harry's injury was caused by a knife brought to the scene by Lloyd-Hall, who was also aged 16 at the time.
Ms Ledward told the court that Harry and Lloyd-Hall did not know each other