A schoolboy who killed a Sheffield student on his lunch break has been found guilty of murder.
Harvey Willgoose, 15, was stabbed in the heart by a hunting knife that another 15-year-old boy brought into school.
Sheffield Crown Court heard how other pupils fled "in fear and panic", with some locking themselves in a school cupboard.
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The attack occurred at All Saints Catholic High School in Sheffield on February 3.
The defendant, who cannot be named due to his age, admitted to manslaughter but denied murder, saying he "snapped" after a long period of bullying.
However, prosecutors said he "knew exactly what he was doing" and "wanted to show he was hard".
Reading a family statement outside court, Harvey's sister Sophie Willgoose said: "On February 3, we did not just lose Harvey, we lost a part of ourselves.
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Willgoose died after being stabbed in the heart with a hunting knife
| PA"Harvey was full of life, warm, funny and caring with a unique ability to bring people together. He was deeply loved by his family, cherished by his friends, and respected by all who knew him."
A jury found the defendant guilty by a majority of 11 to 1 after deliberating for more than 14 hours.
He is expected to be sentenced in October, when the judge will also consider an application to lift his anonymity.
The defendant pleaded guilty to possession of a knife on school premises.
Harvey's mother, Caroline Willgoose, burst into tears, while holding her husband Mark's hand.
Sheffield Crown Court heard the stabbing was probably an "act of retribution", to "get back at Harvey for something".
The trial heard the two boys had fallen out several days before the attack, taking opposite sides in a dispute.
Prosecutors said the defendant had an "unhealthy" interest in weapons and had photos on his phone of him posing with machetes and knives.
Harvey Willgoose's sister Sophie Willgoose (centre) reads a statement with her parents Caroline (centre left) and Mark (centre right) outside Sheffield Crown Court
|PA
The court also heard the defendant "had a significant history of becoming angry and using violence at school".
Prosecutor Richard Thyne KC said the defendant had researched rage rooms and, just over a week before the fatal stabbing, searched "waiting for someone to swing so I can let out my anger".
One teenage witness said there was an altercation before the defendant punched and pushed Harvey, later stabbing him in the heart.
Giving evidence, an eyewitness said: "We went inside to go and tell a teacher, but the teacher was frozen as well. She didn't know what to do. People were running, screaming everywhere. It was, like, chaos."
Chris Hartley of the Crown Prosecution Service said: "Very sadly, knife crime continues to be an awful blight on local communities, leaving people completely devastated by the senseless loss of young lives.
"We hope that these guilty verdicts bring some comfort to the Willgoose family that justice has been served here today.
"We remind teenagers that there can be horrendous and serious consequences of carrying knives. It has been proven that if you carry these weapons, you are more likely to use them or be a victim of knife crime. You are putting yourself, other people and your future at risk."
Louise Haigh, MP for Sheffield Heeley, said an independent review would now take place into the circumstances that led to Harvey's death, adding: "It is absolutely essential that all questions are answered and that any and all lessons must be learned."