A man has pleaded guilty to the manslaughter of Sybil Sibthorpe from Darlington.
Lee Grainger, 41, of St George's Hall, Elmfield, Darlington, had denied murdering the 80-year-old grandmother, who was found with head injuries in the garden of a property in Haughton Road, Darlington, in May.
He pleaded guilty to manslaughter on the grounds of diminished responsibility at Teesside Crown Court.
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Robert Hodgson, from Stanley, County Durham, committed the offences on the girls, aged as young as five or six, up to the age of 13.