A 15-year-old boy will go on trial at the Old Bailey on Monday accused of killing a student who complained about youngsters throwing conkers at him.
Steven Grisales, 21, died on September 1 last year after being stabbed in the heart in Edmonton, north London.
Mr Grisales, of Enfield, north London, was on his way to Silver Street station after visiting his grandmother and shopping for her.
He was due to embark on a three-year architecture course as part of a scholarship from Westminster College.
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