The family of a 13-year-old girl stabbed to death in a park in Doncaster have said her loss is "so painful words cannot begin to explain".
Casey Kearney, 13, was attacked in Elmfield Park, Doncaster, just after 1pm on Tuesday.
She managed to call police and a passer-by phoned for an ambulance, but despite doctors' efforts she died in hospital hours later.
A 26-year-old woman has appeared in court charged with her murder.
Hannah Bonser, of Cusworth House, Doncaster, who is also charged with two counts of possessing a bladed item, spoke only to give her address during a brief hearing.
She was remanded in custody until February 23, when she will appear at Sheffield Crown Court.
A post-mortem examination determined that the 13-year-old died of a single stab wound to the abdomen.
In a statement, her family said: "Losing Casey has been so painful words cannot begin to explain.
"She was the most beautiful, intelligent and bright young girl with her whole life ahead of her.
"We need time alone with family and friends to start to come to terms with our loss."
John Willis, who comforted Casey as she lay injured, said he was alerted by his two sons who saw her on the ground semi-conscious.
He said: "We got her in the recovery position. She didn't move a lot and she didn't speak. Her breathing was very shallow and she was very pale.
"The police arrived very promptly and took over the situation. I was very upset, it was very shocking."
Elmfield Park remains closed to the public while police continue their investigation.
Detective Superintendent Terry Mann, of South Yorkshire Police, said officers were trying to establish Casey's movements after she left her home in Rossington at around midday on Tuesday.
He said she was intending to catch the bus to Doncaster town centre where she planned to meet a friend.
He has appealed for any members of the public who were in or near the park at lunchtime on Tuesday and either saw anything suspicious, or Casey herself, to get in touch.
They are asked to call the incident room on 01709 443510 or ring Crimestoppers anonymously on 0800 555 111 .
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