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Mr Reads prosecuting, said: 'At around 4.20pm a local resident was returning from walking her dogs. Both girls appeared to be playing on the grass.'As she got closer both girls got up and Katie didn't appear to be in any distress.
She thought they were just two girls playing and it didn't cause her any concern.'At around 4.35pm her husband Peter Mills was returning home by car. She was distressed and covered in mud.'His first reaction was that she had been the victim of a serious attack.
Pathologists found that a gloved hand was held over her face to suffocate her before she had her neck and torso slashed.
Her solicitor confirmed her name when asked by the judge, Mr Justice Soole.
She was reported to have no heart output but resuscitation attempts continued until they arrived.'However, attempts to revive her failed and she was certified dead at 5.44pm.'The defendant was detained at the Mills' house.
She appeared upset and was crying and the officer who arrested her also thought she was in shock.'All she would say is she had been on the field.
The dark-haired defendant, who cannot be named for legal reasons, appeared via video link at Leeds Crown Court this morning wearing a black hooded top.
Flanked by a solicitor, she covered her mouth with her hand and looked at the floor as she entered her plea.And 48 hours before killing Katie, the teenager posted a picture to Instagram of self-harm wounds to her arms with the caption: 'Mentally, seriously, not okay.' The teenager pleaded guilty at the court to manslaughter by diminished responsibility but not guilty to murder, which was accepted by prosecutors.