A teenager with a fixation on knives, who fatally stabbed a fellow student at school, has been identified as Mohammed Umar Khan.

The 15-year-old was convicted of murdering his peer, Harvey Willgoose, also 15, during a break at All Saints Catholic High School in Sheffield on February 3.

In a brief, nine-second altercation witnessed by other students in the school courtyard, Khan delivered a lethal stab wound to Harvey’s heart at 12:15 p.m. The two boys had recently clashed on social media.

During the trial at Sheffield Crown Court in August, Khan was found guilty of murder. His defense claimed that the act was manslaughter, citing bullying as a trigger for losing control, but the jury was unconvinced.

Today, at the beginning of the sentencing hearing, Mrs. Justice Ellenbogen removed a reporting restriction, previously preventing the press from revealing the defendant’s identity, who was known as Umar during the trial.

Media outlets had advocated for lifting the restrictions, arguing that it could help deter potential offenders and raise public awareness about the serious issue of knife crime.

The judge said: ‘This was a serious crime carried out by one pupil against another on school property with a knife that was brought into school and was witnessed to varying degrees by other pupils and teachers.

‘The public will wish to know the identity of those who commit serious offences in seeking to understand how a child of that age could do so.’ 

Born and raised in Sheffield, Khan hails from a Pakistani family, but has lived and been educated in the city for his entire life. 

He was in the same school year as Harvey. 

Harvey’s parents, Mark and Caroline, were today watching from the back row of the public gallery with other family members, including his sister, Sophie.

The defendant’s family sat on the front row of the gallery, which looks down on the courtroom.

Khan was wearing a waterproof black hoodie in the glass-fronted dock and he was flanked by three security guards and an intermediary.

He will be jailed later today. 

Harvey’s mother, Caroline, previously told the Daily Mail in an exclusive interview that she blamed the school more than her son’s killer for his death.

Mohammed Umar Khan, 15, can today be named as the killer of fellow school pupil Harvey Willgoose

Harvey Willgoose, 15, died from a stab wound to the heart when he was attacked at All Saints Catholic High School in Sheffield 

Harvey’s killer was caught on camera brandishing a knife in the canteen after the murder 

Harvey’s family, pictured arriving at court yesterday as the jury continued deliberations, have been present for most days of the trial

The trial heard that Khan had a history of being bullied over a medical condition and became increasingly scared for his own personal safety in the months before the killing. 

He described a difficult home life during his evidence, claiming his mother had mental issues and his father – who was often in Pakistan and absent from the family home – would beat him for minor indiscretions. 

Police found his phone to be a catalogue of obsession: full of images and videos of him posing with his weapons or chasing people with them, as well as searches for all manner of weaponry.

On some clips he put drill rap music over the top and posted them on social media

In December last year, his mother found the axe in his gym bag and informed the school, who called the police. He was then visited by a police officer who warned him at length about the dangers of carrying weapons – but he insisted that the axe was not his.

Harvey, however, had barely attended school that term and only found himself the focus of Khan’s rage when he made the fatal mistake of supporting another boy with whom he had fallen out during a social media row.

It related to an incident in the school five days before the fatal stabbing, on January 29.

On that day, Khan tried to intervene in an altercation involving two other boys and had to be restrained by a teacher.

When he claimed one of these boys had a knife, a lockdown was declared and police were called, although no weapon was found.

Ms Willgoose said Khan’s involvement in the knife scare represented a critical missed opportunity and, at very least, he should have been searched when he arrived at school on February 3.

On the morning of the attack, CCTV from the school showed Khan in a series of escalating confrontations with Harvey, which the prosecution said were attempts to ‘wind him up’.

Khan squared up to Harvey in a science lesson around an hour before the stabbing and gestured with his hand inside his jacket pocket ‘like he had a knife’.

Harvey’s killer walking into school on the day of the murder

Harvey seen entering school, around 20 minutes after his killer, on February 3

CCTV released by police shows the boy pushing Harvey in the corridor before the murder

At 12.15pm, when the lunch break started, Harvey approached Khan in the school courtyard to confront him and he could be seen on CCTV pushing Khan’s shoulder.

Khan immediately produced a knife from a coat pocket and lunged at Harvey, twice.

The first stab wound pierced his heart and was dealt with such ferocity it broke through a rib, while the second was a more glancing blow as Harvey retreated.

The entire confrontation lasted just nine seconds. Within 49 seconds, Harvey had collapsed to the floor and slipped into unconsciousness.

The boy then told a teacher as he handed over the murder weapon: ‘I’m not right in the head. My mum doesn’t look after me right.’

In an exclusive interview with the Mail in August, Harvey’s mother Caroline Willgoose has launched a blistering attack on her son’s school – claiming they missed a litany of red flags about his killer.

The Mail revealed a concerned parent contacted All Saints as far back as October 2024 after hearing Khan had been showing other pupils an axe in school.

But the school apparently failed to take any action against the pupil, with no reference made to it in his official school record, despite the parent being told the matter would be investigated.

The revelations suggest the school was aware of the killer’s dangerous fixation with weapons months earlier than previously realised.

Ms Willgoose said: ‘I blame them. I blame them more than him. There were so many flags.’