Jury hears of "dark fantasies" of girl accused of transgender teen Brianna Ghey's murder
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The youth, identified only as girl X, said she also fantasised about killing Brianna, 16, but had "no intention" of bringing it to reality, Manchester Crown Court heard.
Brianna was stabbed 28 times in her head, neck, chest and back with a hunting knife after being lured to Linear Park in Culcheth, near Warrington, on February 11.
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Hide AdGirl X from Warrington and another youth, identified only as boy Y from Leigh- both now 16 but aged 15 at the time of Brianna's death, both deny murder and are blaming each other for the killing.
Neither defendant can be identified because of their ages.
On day 10 of their trial, girl X gave evidence from the witness box, screened from the view of the public gallery by a curtain and accompanied by an intermediary to assist her welfare.
She told the jury she began to fantasise about killing people aged 14, around the time she began to take an interest in "dark materials" such as films of murder and torture and serial killers.
Girl X said she had downloaded an app that allowed her to search for such things on the "Dark Web".
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Hide AdRichard Pratt KC, defending girl X, said: "Did watching films about murder and torture make you want to torture or kill people?"
Girl X replied: "No. I found the whole idea of it interesting. Different personalities of serial killers and different ways they would carry things out."
She said boy Y also had "similar interests" to her.
Girl X continued: "I would share the dark fantasies that I have.
"Things to do with murdering people and torturing people. He would go along with it. He seemed to like that sort of stuff."
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Hide AdShe denied being "obsessed" with Brianna, but said she found her "different" and "interesting".
And she said in Snapchat messages between her and boy Y, he had refereed to Brianna as an "it" because, she said, "he doesn't agree with people who were trans or gay".
Mr Pratt said: "Did you have any anti-transgender views?"
Girl X replied, "No."
Girl X denied trying to give Brianna an overdose to kill her a few weeks before she was stabbed, after telling boy Y she had given Brianna Ibuprofen pills but that she had a high tolerance and had not died.
She said: "I was making a fantasy about killing Brianna even though I had no intention."
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Hide AdMr Pratt also asked Girl X about five other children on her and boy Y's alleged "Kill list".
Again she said these were all just fantasies and she had no intention of carrying them out.
Telling boy Y she wanted to keep the teeth or eye of one purported victim was again part of the fantasy and something some serial killers had done.
Girl X said at times she would self-harm as a "coping" mechanism, and the court has heard she has "traits" of autism and ADHD.
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Hide AdShe also said she had, at times, felt suicidal and was taking medication.
Earlier, jurors were shown a crumpled, hand-written note of an alleged "murder plan" to kill Brianna found on the bedroom floor of Girl X after her arrest.