After finishing his lunch, cleaner Vincent Stanford then drove back to Leeton High School and began to clean the small room where he had murdered and raped the 26-year-old who was just days away from marrying.

When he was finished he drove the body of Ms Scott back to his house on Maiden Avenue at Leeton in her red Mazda 3.

Stanford later told police that as her body remained in the boot of the car, he washed her clothes before hanging them out to dry on his washing line in the backyard.

He would later discard most of her clothes and belongings in bins around Leeton, but told police he kept her red bra because, "maybe I wanted a souvenir".

These calm and considered actions of Stanford, and his emotionless, almost relaxed, confession to police days later, were at odds with the "cold-blooded, merciless, sexually motivated killing" he had just carried out.

Two days later, on Tuesday April 7, Stanford was back cleaning again, but this time at TAFE Leeton.

One witness told police that he remembered seeing Stanford with scratches on his face and recalled him giggling and smiling when the subject of Ms Scott's whereabouts was raised.

Later that day when police called by Stanford's house to question him, he yelled out to them as they were leaving, "Hey – Good luck with the search".

The sickening details of what Stanford did and the way he acted in the days after Ms Scott's murder emerged at his sentencing hearing at the NSW Supreme Court at Griffith on Tuesday.

More than a dozen of Ms Scott's family and friends attended the hearing and all wore a touch of yellow – the bubbly English and drama teacher's favourite colour.

They sat only metres from Stanford, who sat in a white shirt with his head hung low for the majority of the hearing.

Crown prosecutor Lee Carr asked that a life sentence be imposed, describing the murder as a "cold-blooded, merciless, sexually motivated killing."

An agreed statement of facts tendered to the court also outlined how, two months before the murder, Stanford typed eight chilling search terms into his computer.

On February 21, 2015 Stanford searched the phrase "bride rape" and then "bride kidnapping".

The search terms that followed referred to the sexual assaults of brides.

"The search histories from the offender's phone and computer reveal the offender very regularly searched in relation to violent rape, violent sex, hard-core porn and murder," the facts stated.

"He also conducts searches in relation to necrophilia and 'necro rape'."

The documents also revealed the strange behaviour of Stanford in the lead-up to Ms Scott's murder, including the way he lingered around the girls' toilet block at the school.

There was also one occasion when he was seen entering the girls' toilet at a time when he had no reason to be at Leeton High School.

He was also sighted at the school during some weekends in March and the Sunday before he murdered Ms Scott.

Stanford worked as a casual cleaner at a variety of schools in the state's Riverina,  including Leeton TAFE, Leeton Public School, Leeton High School, Yanco Agricultural High School, Narrandera Public School , St Joseph's Primary School and Parkview Public School.

The court was played an extract of an electronically recorded interview with police in which Stanford said to officers, "I think I went a little nuts."

When asked by police what he did on the day of the murder, Stanford spoke clearly and without hesitation.

"I did it at the high school ... I beat her to death."

The 25-year-old said he struck Ms Scott 30 or 40 times and offered no explanation as to why he killed her.

"Just that I had to kill her. I wasn't angry or anything. Basically emotionless. Just that I had to kill her."

Stanford also confessed to having tried to strangle a teacher when he was 13 years old. Hewas put in a mental institution for two months in Holland.

Stanford was seen on Tuesday for the first time in public since the April 2015 murder when he was walked into the Griffith courthouse by Corrective Services officers.

In July Stanford pleaded guilty to the aggravated sexual assault and murder of Ms Scott.

And in an act that sickened Ms Scott's family to their core, Stanford sent the young teacher's engagement and graduation rings to his twin brother Marcus in South Australia.

In August Marcus Stanford was sentenced to one year and three months in jail after he had earlier pleaded guilty to being an accessory after the fact to murder.

Vincent Stanford is expected to be sentenced on Thursday by Justice Robert Allan Hulme.