Serial Paedophile Michael Guider To Walk Free From Prison

Michael Guider, the serial paedophile who killed Sydney schoolgirl Samantha Knight, will walk free from prison on Thursday.

It comes after the NSW attorney-general was advised an appeal against a Supreme Court decision allowing his release would fail.

In a statement on Wednesday night, Mark Speakman said he had received advice from Crown Advocate Dr David Kell SC and Joanna Davidson on the prospects of a successful appeal against the Supreme Court decision that denied his application for a 12-month Continuing Detention Order against Guider.

"Having considered that advice, I have reached the regretful conclusion that such an appeal would fail," Mr Speakman said.

Photo: 10 News First

A Supreme Court judge on Tuesday rejected an application to keep Guider behind bars for another year, instead imposing a five-year extended supervision order with dozens of strict conditions.

The now 68-year-old pleaded guilty in 2002 to the manslaughter of nine-year-old Samantha, who disappeared from Bondi on August 19, 1986.

Her body has never been found.

Guider's 17-year jail term has expired but he was placed on an interim detention order that ends on Thursday, when he will walk out of prison.

"This offender is one of the most despicable individuals to come before our justice system. Whatever disappointment I may feel at [Tuesday's] outcome is nothing compared with the distress and concern of his many victims and their families," Speakman said.

NSW Attorney General Mark Speakman Photo: Joel Carrett via AAP

READ MORE: Mother's Horror As Pedophile Who Killed Her Daughter To Be Set Free 

"We have done the best we can to try to keep him detained and failing that, have him under very strict conditions.

"He will be supervised incredibly closely and we will watch him like a hawk," he continued.

Speakman said the strict conditions mean Guider will be subject to 24-hour electronic monitoring, will be told where to live, who he can see and where he can and cannot go.

He also will have his internet usage monitored, and must abide by a night-time curfew.