A 15-year-old boy who stabbed fellow pupil Harvey Willgoose to death during a school lunch break can be named, a judge has ruled. Harvey, also 15, was stabbed in the heart by Mohammed Umar Khan at All Saints Catholic High School in Sheffield on 3 February, in front of pupils who fled in fear. The attack led some students to hide in a cupboard, the Crown Court heard.

Khan, found guilty of murder in August, is due to be sentenced by the trial judge, Mrs Justice Ellenbogen. On Wednesday, the judge lifted an order that had barred identification, after applications from several news organisations. She said she had to balance reporting a very serious case with the welfare of the defendant, who turns 16 next month.

Harvey’s sister, Sophie Willgoose, gave a victim impact statement in court, telling the judge that the act ‘didn’t just end Harvey’s life, he ended ours too’ and that the family continues to seek justice. The court was shown CCTV footage of the stabbing, which jurors heard showed Khan stabbing Harvey twice, with one blow piercing his heart. An assistant headteacher removed the knife and heard Khan say, ‘you know I can’t control it’. Earlier in the case, there had been a succession of encounters between Harvey and Khan, including a January 29 clash that led to a lockdown and a police response, though no weapon was found. Over the weekend before the attack, the two were involved in disputes on social media, and Khan had told staff he carried a knife for protection after fearing other teenagers with weapons. Since Harvey’s death, his family have campaigned against knife crime, including proposals for knife arches in schools.