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Court hears killer's chilling confession

AAP logoAAP 11/10/2016 Miranda Forster

Self-confessed murderer Vincent Stanford told police he went "nuts" and felt he had to kill NSW teacher Stephanie Scott after he saw her alone at the NSW school where they both worked, a court has heard.

Stanford's chilling video-recorded confession was played before a packed sentence hearing in Griffith, southwest NSW, on Tuesday.

Ms Scott's family watched in silence as the cleaner was shown calmly telling detectives how he grabbed the 26-year-old at Leeton High School on Easter Sunday 2015 and dragged her into a storeroom.

He said he punched her until she stopped moving and stabbed her in the throat with a 40cm knife "to make sure she was dead".

"I think I went a little nuts," he said, when asked why he did it.

"I just could not stop myself."

He told police a feeling came over him "just that I had to kill her".

Ms Scott was due to marry her long-term partner Aaron Leeson-Woolley six days after she was killed.

She was at school that day to prepare lessons for her substitute ahead of the planned honeymoon in Tahiti.

Stanford pleaded guilty to aggravated sexual assault and murder in July and faces a possible life sentence with no parole.

His identical twin brother Marcus Stanford walked free from prison last month after serving 15 months for selling Ms Scott's rings and burning her driver's licence.

Vincent Stanford is due to be sentenced on Thursday.

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