He denied involvement but a jury found him guilty at a trial in 2002, and he was ultimately sentenced to life imprisonment for murder, preventive detention for rape, and concurrent sentences of 14 years for abduction and other offences relating to the horror, with a minimum term of seven years.
He first became eligible to apply for parole in 2009, when it was declined along with the imposing a of a three-year postponement order, the maximum allowed until the law change six months ago.
According to the Parole Board, no submissions were received from Mikus in the latest proceedings, despite prompting, and it was consistent with "non-engagement with the parole process right from the beginning".
Mikus had taken no steps to address the "very serious sexual and violent offending", declining to take part in programmes and interventions with a Corrections psychologist.
"Given his assessed very high risk of sexual reoffending, we are satisfied that even if Mr Mikus changes his mind and engages now, it will take at least five years before there is any prospect that he could be safely released," wrote Mikus' parole hearing convener, Marion Frater.
She noted that if Mikus believes there are significant changes in his circumstances there is provision for him to re-apply earlier.
