Police investigating the murder of missing New South Wales teacher Stephanie Scott have found a woman's body in bushland north of Griffith.

Police dive team members remove a laptop computer from an irrigation canal near Leeton. ( AAP: David Moir )

The discovery was made around 5:00pm (AEST) on Friday at Cocoparra National Park, north of Griffith in southern New South Wales, about 70 kilometres from her home town, Leeton.

A crime scene has been set up at the location and forensic specialists are processing the scene.

NSW Police will provide an update on developments in the search at 9:30am.

Ms Scott was allegedly murdered on Easter Sunday by Vincent Stanford, a 24-year-old cleaner from her workplace, Leeton High School.

Stanford was charged with the murder on Thursday, and has been remanded in custody to reappear in Griffith Local Court via videolink in June.

The 26-year-old English and drama teacher was last seen at the school on Myrtle Street about 11:00am on Sunday, police said.

Earlier police had turned their sights to a canal in the Murrumbidgee irrigation area — near where Ms Scott's car was found on Thursday — after a witness reported seeing a man throw something into it on Monday.

While searching the canal, police found a laptop in two metres of water.

Griffith local area commander Superintendent Michael Rowan said police were also still asking the public to come forward with information about the whereabouts of a white Toyota Hilux between Sunday and Wednesday.

"We have the accused's car," he said.

"We are really interested in people who might have sighted it between Sunday lunch time and Wednesday night."

Police are appealing for anyone who saw this Toyota Hilux between Sunday and Wednesday to contact police. ( Supplied: NSW Police )

Community picnic organised for wedding day

Meanwhile, Ms Scott's family has invited community members to gather and celebrate her life on what should have been her wedding day.

Ms Scott was supposed to marry her partner of five years, Aaron Leeson-Woolley, in the Central West town of Eugowra today.

Stephanie Scott should have married her long-term partner today. ( Supplied: Facebook )

Instead, her family has invited everyone to join them at Mountford Park in Leeton at lunchtime to celebrate the 26-year-old's life.

In a statement on social media, the family encouraged people to pack a picnic, wear yellow and bring their favourite memory of Ms Scott.

"[It] should have been the happiest day of Stephanie and Aaron's lives," the statement read.

"To help us all through this difficult time, we invite everyone to join us at Mountford Park, Leeton ... for a lunchtime affair to celebrate the life of our 'Button-Nose'."

Local people have been mourning the loss of the popular teacher with a growing bank of floral tributes outside Leeton High School.

Local Griffith Mental Health Service counsellor John Dean said support will be offered to the community for as long as it is needed.

"We'll be talking with the council and with the school," he said.

"I know the school has some plans for supporting staff and students when they get back to school in a week's time and we'll talk to them and find out what they need from us."