Tia Rigg was found by police at the house on 3 April A man obsessed with rape, torture and child abuse has admitted murdering his 12-year-old niece.
John Maden lured Tia Rigg to his home in Cheetham Hill, north Manchester, on the pretext of babysitting – but drugged and killed her.
He then called police himself and was “chillingly calm” when officers arrived, Manchester Crown Court heard.
Maden, 37, who is the brother of Tia’s mother Lynne Rigg, pleaded guilty before the start of his trial.
The court heard that Maden had become obsessed with violent pornography and images of child abuse that he had downloaded from the internet.
Gordon Cole QC, prosecuting, said: “In general terms this murder was premeditated.
“It was murder purely for his sexual gratification – it had a sexual motive. The facts reveal clearly features of torture, rape, physical abuse and the ultimate murder of a child.”
Mr Cole said Maden had developed an “obsessive interest” in images and literature relating to paedophilia, rape and torture.
“He had an extensive library of such materials which included literature dealing with methods of killing,” he told the court.
The hearing continues.
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