Cheryl Grimmer's three brothers are lobbying the NSW Government to amend laws so that the man once charged with her murder can face trial.
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They claim the NSW justice system failed them when it allowed a man charged with the murder of three-year-old Cheryl to walk free on a technicality.
A petition for legislation change has already received half the 5000 signatures it needs for the issue to be raised in Parliament.
Cheryl was three years old when she disappeared from Fairy Meadow beach in 1970.
In the petition, Ricki Nash, Chery'ls eldest brother, calls on NSW Attorney-General Mark Speakman to amend legislation so that a confession, ruled inadmissible, can be heard.
A year after Cheryl disappeared, a person confessed to NSW police that he had abducted and murdered Cheryl.
This person, who cannot be named as he was aged 17 at the time of his confession, stated that his intention was to rape her.
In a pre-trial hearing earlier this year, the confession was ruled inadmissible by the NSW Supreme Court because the accused had no adult support present during the 1971 police interview.
At the time this was not a legal requirement and current legislation does not necessitate that adult support had to be present for the interview to be admissible.
However the judge ruled the laws applied retrospectively.
"My brothers and I have endured a life sentence wondering what happened to Cheryl," Ricki said, adding he suffers the guilt of knowing he left her alone for just a couple of minutes on that day in 1970.
"Cheryl had no adult support present when, according to this man's confession, he took her, tied her up and strangled her," Ricki said.
"Cheryl never got to live her life but he continues to walk free."
He thanked the public for the "overwhelming support and comforting words from across Australia and the United Kingdom, as we seek justice for our baby sister Cheryl".
Meantime, the Grimmer family is holding a memorial walk in January next year to mark 50 years since Cheryl disappeared and invite the public to attend.
The walk starts at Balgownie Public School at 10am on January 12 and finishes at Fairy Meadow beach where the memorial will be unveiled.
If you have any information about the disappearance of Cheryl, no matter how small, contact Crime Stoppers on 1300 222 000.
The Grimmer family is urging people to support their call for legislation change.
To sign the petition visit change.org.