Casey Kearney stabbing death accused 'troubled'
2 July 2012 Last updated at 19:44 BST
A woman accused of stabbing a 13-year-old girl to death in a Doncaster park had a troubled history, a court has heard.
Hannah Bonser, 26, is charged with murdering Casey Kearney at Elmfield Park on Valentine's Day.
Prosecutor Graham Reeds QC told Sheffield Crown Court that Ms Bonser had previously spent time in a psychiatric hospital. She denies murder but admits killing the teenager.
Danny Savage reports.