The parents of one of the victims of the Claremont serial killer in Perth say time has not healed their loss 20 years after their daughter disappeared.
Secretary Sarah Spiers, 18, was the first victim of the serial killer and is presumed dead, having not been seen since January 27, 1996.
Her parents, Don and Carol Spiers, issued a statement via police on Friday, saying words could not describe their heartbreak.
"It's hard not to wonder what Sarah's life, and ours, could have been had she not been taken from us," they said.
"She was so full of life and had a great love of family."
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The parents thanked friends and family for their support, and police for keeping them well-informed about the investigation.
"We retain confidence in the Macro investigation team to solve this case," they said.
The other victims were 23-year-old childcare worker Jane Rimmer, who was killed a few months after Ms Spiers disappeared, and 27-year-old lawyer Ciara Glennon, who was murdered in March 1997.
Both their bodies were found later.
Assistant Commissioner Michelle Fyfe said the investigation remained open and active.
"The Macro team is applying fresh eyes, modern investigative techniques and the latest advancements in forensic technology to identify the offender or offenders," she said.
"They are committed to pursuing justice for the victims and to providing their families with some answers.
"WA Police is optimistic these crimes can still be solved despite the passage of time."
She warned that public and media speculation on an active case could jeopardise the investigation and affect future prosecutions.
