A 15-YEAR-OLD girl who was obsessed with serial killers, snuff movies and “dreadful” online material has been detained for 10 years for stabbing a friend in the grounds of a Hampshire school.

Winchester Crown Court heard the “intelligent, articulate” girl, who cannot be named for legal reasons, was previously considered “part of the nice crowd” by her deputy head teacher.

But that all changed on April 25 when the girl “with the devil inside her” lunged with a kitchen knife at a close friend she suspected of bullying her online.

The court previously heard the defendant lured the victim to a quiet part of the school before asking her to hold out her hands and close her eyes in expectation of a present.

The victim escaped serious injury or death after opening her eyes just as the defendant – who had researched fatal stab wounds to the heart – was lunging a knife towards her chest.

She suffered minor chest wounds after moving away while the defendant ran off before being brought back to school, where she was interviewed and arrested.

The girl, who admitted to wounding the victim and being in possession of a bladed article, denied a count of attempted murder but was found guilty by a jury after a short trial.

During the trial, the court heard that the defendant had an obsession with serial killers and even based a GCSE art project on American serial killer Ted Bundy.

She also drew up a “kill list” of 60 people and made outline plans in a journal to carry out a school shooting, similar to the Columbine massacre, before burning the evidence.

The judge, Mr Justice Fraser, said that some of the defendant’s evidence in court was “quite chilling” before saying there was “no comprehensible motive” for the attack.

He also highlighted the “dark side of her personality” and raised serious concerns about the availability of the material she watched online, which included an IS terrorism video and the rape of a baby.

He said: “You watched snuff movies on the internet, and would show these to you friends at school on your phone, for shock value.

“These films showed people being actually tortured and killed, with these dreadful images recorded and posted online. It is shocking that such dreadful material is available to anyone – including a minor – who has a smart phone.”

James Newton-Price, prosecuting, told the court that the 14-year-old victim has suffered nightmares, trust issues and had been diagnosed with Post Traumatic Stress Disorder following the attack.

The Judge rejected an attempt to lift an order restricting identification of the defendant’s name or school because of the effect it could have on the victim.

Michael Parroy, for the defendant, called the accused, who was 14 at the time of the incident, a person who had struggled with her emotions and showing empathy with others.

He called the incident a “considerable tragedy” before describing the accused as a “troubled young woman” who “carried a devil inside her”.

Justice Fraser told the accused she “might be described as homicidal” before detaining her for 10 years and imposing a four-year period where she could be released on licence.

He also imposed a restraining order, banning the accused from making any contact, directly or indirectly, with the victim.