The mother of a nine-year-old killed by convicted paedophile Michael Guider has called on the NSW Government to keep him in jail, labelling him "a danger" to the community.

Key points: Samantha Knight was killed in August 1986 in Bondi by convicted paedophile Michael Guider

Samantha Knight was killed in August 1986 in Bondi by convicted paedophile Michael Guider A 130,000-strong petition calls on the NSW Government to enact a law keep killers like Guider in jail

A 130,000-strong petition calls on the NSW Government to enact a law keep killers like Guider in jail A hearing will be held on Monday to assess whether Guider should remain behind bars

Tess Knight, the mother of Samantha Knight who was last seen on a Bondi street in August 1986, marched in Bondi Beach today to call on the Government to pass Knight's Law — a petition calling on killers who refuse to reveal where their victims bodies are hidden to remain locked up.

Michael Guider, now 69-years-old, was in 2002 sentenced to 16-years jail for the manslaughter of nine-year-old Samantha.

Guider has refused to reveal any details about the location of her body and her remains have never been found despite extensive searches.

On Monday a preliminary hearing will be held in the Supreme Court to hear Attorney-General Mark Speakman's application to keep Guider in jail for a further 12 months, and introduce an extended supervision order of five years.

Speaking to the ABC after the march on Bondi Beach, Tess Knight said she was not satisfied it was safe for Guider to be on the streets.

"It's almost impossible to put into words," she said.

"He hasn't told us what happened when he took Sam and kidnapped her.

Tess Knight says Guider is still a danger to the community ( ABC News )

"He hasn't told us the details of when he killed my daughter … that indicates to me that he has no remorse.

"He's a danger. I'm not satisfied that's it's safe to release him into the community."

She said she had spoken to the Attorney-General's office and will be present in court on Monday.

The call was backed by Chantelle Daly, the organiser of today's march, who was abused by Guider as a six-year-old.

"He's still a threat," she said.

"It should be terrifying to everyone.

"I think him being released into his old hunting ground is exactly what he wants."

Chantelle Daly says more needs to be done to protect children from men like Guider ( ABC News )

Almost 130,000 people have signed an online petition to enact Knight's Law, which would see any convicted child killer receive harsher sentences or penalties if they failed to disclose the location of their victims' remains.

NSW Attorney General Mark Speakman did not address Knight's Law specifically, but said he had called on the NSW Sentencing Council to "review sentencing for murder and manslaughter" and the standard non-parole periods for the same crimes.

"The NSW Government is committed to ensuring that sentences for murder and manslaughter continue to reflect the public's expectations and keep our community safe," Mr Speakman said.

He said it would be inappropriate for him to comment on Guider's preliminary hearing as it was before the court.

Guider drugged children before abuse

A judge found that on the August 19, 1986 Guider took Samantha to a location, which has not been determined, and gave her Normison, most probably with the intention of taking indecent photographs of her.

After she stopped breathing, Guider disposed of her body.

Guider's 14-year manslaughter sentence is due to expire on June 6 this year. He remained in jail passed his non-parole period of June 2014.

Michael Guider pictured before sentencing in 2002. ( AAP: Mick Tsikas )

In early 1996, when he was a gardener at Royall North Shore Hospital, two young children, both seven-years-old, complained that he had indecently assaulted them and took nude photographs of them.

Searches of his work shed and home found thousands of images showing children in indecent poses and in the course of being sexually assaulted.

He had been a regular visitor to the homes of the children's mothers, whom he had befriended, and he had provided gifts and hosted outings for the children.

In a number of instances the children had been given the drug Normison mixed with Coca Cola, as a prelude to the sexual assaults.

Guider was previously sentenced to 16 years jail for 16 charges of administering a stupefying drug with intent to commit an indictable offence — that sentence expired in February 2006.