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  1. ITV Report

A mental health charity worker has been giving evidence in Casey murder trial

On trial: Hannah Bonser Photo: Calendar

A woman told staff at a mental health charity she had "done something silly" after she fatally stabbed a 13-year-old girl in a South Yorkshire park, one of the workers has told a jury.

Hannah Bonser, 26, went into the offices of the Rethink organisation in Doncaster, after she attacked Casey Kearney in Elmfield Park in the town, Sheffield Crown Court heard.

Casey died later in hospital.

Casey Kearney was attacked in Elmfield Park in Doncaster Credit: Calendar

Rethink worker Alan Brown told the court today that he answered the door to Bonser that day.

He said she asked to speak to his colleague, Tareen Mallin.

But he added that Bonser wanted him to stay because Miss Mallin would not be safe otherwise.

Mr Brown told the jury: "She felt that she'd done something silly and she wanted to speak to somebody.

"She then said that she's stabbed somebody."

Mr Brown said they went back inside the building where Bonser handed over two knives and the police were called.

He told the jury: "She was as calm as could be.

"She was lucid in her speech.

"It was as though we were just having a general conversation.

"There was no worry. There was no anxiety."

Bonser denies murdering Casey, who was from Rossington, Doncaster, on February 14.

The court has heard she does not deny attacking Casey but is likely to claim diminished responsibility due to her mental condition.

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