High school cleaner Vincent Stanford has pleaded guilty to the murder and aggravated sexual assault of New South Wales school teacher Stephanie Scott.

Ms Scott, 26, was last seen on April 5 last year at Leeton High School, in the Riverina region of NSW, just days before her wedding.

Stanford, a 24-year-old cleaner at the school, was arrested four days after and was charged with her murder, aggravated sexual assault and inflicting actual bodily harm.

The teacher’s burnt body was found by police in the Cocoparra National Park about 70 kilometres from the town of Leeton, five days after her disappearance.

Stephanie Scott was due to be married only days after her murder. Photo: Facebook.

It was alleged Stanford raped Ms Scott the same day she was last seen alive and then killed her.

In March, he was committed to stand trial but appearing on screen from Long Bay jail at the Supreme Court in Sydney today, he pleaded guilty to murder and aggravated sexual intercourse without consent.

Members of Ms Scott’s family were in court to witness the pleas.

Stanford’s identical twin brother, Marcus, was also charged over his involvement in Ms Scott’s death after being extradited to NSW from his home at Forreston in South Australia.

In March, he pleaded guilty to being an accessory after the fact to murder.

Justice Robert Allan Hulme told the court today Vincent Stanford would be sentenced in Griffith within a week of his sentencing hearing set for October 11.

Viagra, knife, cleaning products among evidence

In March, 16 volumes of evidence against Vincent Stanford were tendered to Griffith Local Court.

Among the evidence were pornography and dating site URLS, as well as email invoices for purchases of Viagra, cleaning products, a training sword and a knife.

Email purchases for handcuffs known as “flexi cuffs” were tendered, as well as an email enquiring about legcuffs.

Four volumes of evidence were submitted to the court for Marcus Stanford which included phone recordings between the twin brothers.

A number of Facebook conversations which were not between the brothers, were also tendered.

A Jetstar boarding pass formed part of the evidence against Marcus Stanford, although when the flight was taken was not specified publicly.