Woman 'had been in mental hospital'
A woman fatally stabbed a 13-year-old girl in a random attack in a park just months after spending time in a psychiatric hospital, a court has heard.
Hannah Bonser, 26, is accused of murdering Casey Kearney in Elmfield Park, Doncaster, South Yorkshire, on Valentine's Day.
Bonser told a friend she planned to "get" anyone who crossed her and bought two knives before stabbing Casey, Sheffield Crown Court heard.
She may have prepared for the attack by stabbing a door in her flat, the jury was told.
Graham Reeds QC, opening the case for the prosecution, said Bonser had a "troubled history" and had spent a short time in a psychiatric hospital in October 2011.
She was in regular contact with outreach workers at Rethink - a service assisting those with mental health difficulties in Doncaster.
Mr Reeds described Bonser, of Cusworth House, Doncaster, as having few friends and "kept herself to herself".
But one friend described her behaviour as being "odd" after Bonser told her of plans to attack her ex-boyfriend just three days before Casey's death.
Mr Reeds said Bonser accepted she had killed Casey and said it was likely she would claim the partial defence of diminished responsibility, which would reduce what she did to manslaughter.
But he said the prosecution rejected the claim that the defendant "was suffering from an abnormality of mental functioning which arose from a recognised medical condition".