Pictured: Knife-obsessed teenager, 15, who stabbed Harvey Willgoose to death at their school

The knife-obsessed teenager who stabbed another student to death in his school might today be called Muhammad Umar Khan.

The 15-year-old was found guilty of murdering Harvey Willgoose, also 15, during the lunch break at All Saints Catholic High School in Sheffield on February 3.

Khan fatally stabbed Harvey in the heart during a nine-second confrontation in the schoolyard in front of other students at 12.15pm. Two children recently had a fight on social media.

He was found guilty of murder after a trial at Sheffield Crown Court in August after failing to convince the jury his actions amounted to manslaughter because bullying caused him to lose control.

At the start of today’s sentencing hearing, Ms Justice Ellenbogen lifted a reporting restriction that had previously prohibited the press from naming the defendant, referred to as Umar throughout the trial.

Media outlets have argued that the restrictions should be lifted as they would provide a growing public understanding of the scourge of knife crime and act as a deterrent to future criminals.

The judge said: ‘This was a serious offense by one pupil against another, committed on school property with a knife brought to school, and witnessed to varying degrees by other pupils and teachers.

‘The public will want to know the identities of those who committed serious crimes as they try to understand how a child could do this.’

Khan will be jailed later today.

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

The trial heard Khan had been bullied over a medical condition and had become increasingly fearful for his personal safety in the months before the murder.

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, who arrived in court yesterday as the jury continued deliberations, were present for most days of the trial.

Police discovered his phone was a catalog of obsessions: It was filled with images and videos of him posing with his guns or chasing people with them, as well as images of him researching all kinds of weapons.

He put rap music on top of some clips and shared them on social media

In December last year, his mother found the ax in his gym bag and notified the school, which called the police. He was later visited by a police officer who warned him at length about the dangers of carrying a gun; but he insisted that the ax did not belong to him.

But Harvey had barely attended school at the time and only found himself at the center of Khan’s ire when he made the fatal mistake of standing up for another boy he had been fighting with during a social media row.

The incident related to an incident at the school five days before the fatal stabbing on January 29.

That day, Khan tried to intervene in an argument involving two other children and had to be restrained by a teacher.

When one of these boys claimed to have a knife, a curfew was declared and the police were called, even though no weapon was found.

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

Security cameras at the school on the morning of the attack showed Khan having a series of escalating confrontations with Harvey, which the prosecution said were attempts to “entrap” him.

About an hour before the stabbing, Khan confronted Harvey in science class and made a gesture with his hand in his jacket pocket “as if he had a knife.”

Harvey’s killer walks to school on the day of the murder

Harvey was seen entering the school about 20 minutes after the killer on February 3

Surveillance footage released by police shows boy pushing Harvey in hallway before murder

At 12.15pm, when the lunch break began, Harvey approached Khan in the school’s courtyard and attempted to confront him, and was seen on CCTV pushing Khan’s shoulder.

Khan immediately pulled a knife from his jacket pocket and attacked Harvey twice.

The first stab wound pierced his heart and was inflicted with such force that it broke a rib, while the second was a more significant blow as Harvey retreated.

The entire conflict lasted only nine seconds. Within 49 seconds, Harvey collapsed and lost consciousness.

The boy later told his teacher as he handed over the murder weapon: ‘I’m not in the right mind. My mother doesn’t look at me much.”

In an exclusive interview with the Mail in August, Harvey’s mother Caroline Willgoose launched a furious attack on her son’s school and claimed they had missed a number of red flags about her son’s killer.

The Mail revealed that a concerned parent contacted All Saints in October 2024 after hearing that Khan was showing an ax to other pupils at the school.

But the school apparently took no action against the student, even though the parent was told the matter would be investigated, with no reference to it in official school records.

What emerges suggests that the school became aware of the killer’s dangerous obsession with guns months earlier than previously realized.

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