Watch the moment a weapons-obsessed teenager confronts a fellow pupil in the school corridor, brandishing the knife he used to stab the schoolboy to death.
Harvey, 15, was knifed to death by a fellow student outside their school cafeteria earlier this year.
CCTV from inside the school shows the killer, who cannot be named for legal reasons, confronting the boy in the corridor before later brandishing the 13cm hunting knife he used to stab the boy twice in the chest at All Saints Catholic High School, Sheffield, in February.
CCTV footage of Harvey Willgoose before he was stabbed to death
The killer was found guilty of murder at Sheffield crown court today.
The defence told the court the killer had "lost control", knifing the victim after years of bullying and "an intense period of fear at school".
He told teachers moments after stabbing Harvey: "You know I can't control it".
The defendant also said "I'm not right in the head" after killing the victim, the court heard.
The boy told the court he had no memory of the moment he killed Harvey.
However, the prosecution called this "a lie".
They said the killer "wanted to show he was hard" and had become "obsessed" with weapons.
Photographs found on his phone showed him posing with knives.
The boy previously admitted manslaughter but denied murder.
A jury at Sheffield crown court found him guilty of the more serious charge. He will be sentenced at a later date.
Harvey's mother says she wants her son to be remembered as the “fun-loving cheeky-chappy” he was as she vows to get knife arches installed in schools.
Caroline Willgoose and her husband Mark have become prominent campaigners against knife violence since Harvey was killed.
Mrs Willgoose said: “I want him to be known as the kid he was.
“I hate that saying ‘Harvey Willgoose, the pupil that was stabbed to death at school’. He’d hate that.
“I want him to be remembered as the fun-loving kid, cheeky-chappy, sociable kid that he was.”
She said: “He was just a joy. He was a million miles an hour, he was a happy chappy, loved life, loads of friends.
“He’s just left a big empty hole.”
Mrs Willgoose said she only realised after his death how well-known Harvey was, even outside his home city – largely through his devotion to Sheffield United Football Club.
She said she had a message from one fan who explained how Harvey had reached out and helped him with his anxiety after meeting up on an away match trip.
And she said football fans came from all over the country to his funeral.
“People knew him all over, and I didn’t know this,” Mrs Willgoose said.
He used to say ‘I’m famous me, you know, mom’, But he was.”
She said: “I get people coming up to me on a daily basis, if I go to town, or Peaks (Crystal Peaks shopping centre) – coming up crying, mothers crying.”
Louise Haigh MP for Sheffield Heeley said: “Today’s verdict will deliver justice for Harvey’s family, but nothing can bring back the son, grandson, brother and friend who was so loved by his family and his community.
“All of Sheffield will be thinking of Harvey’s family and all those who loved him today.“An independent review will now take place into the circumstances that led to Harvey’s death, and it is absolutely essential that all questions are answered and that any and all lessons must be learned.”