Accused Claremont killer Bradley Edwards has had his October court appearance date pushed back by three months.
Mr Edwards was due to make his third appearance in Stirling Gardens Magistrates Court on Wednesday, with a plea likely to have been indicated, but instead will appear on February 28.
The reason for the delay is not publicly known.
The 48-year-old last appeared in court in March via video link from Hakea Prison.
He has been in custody since being arrested by police on December 22, 2016 following a search of his Kewdale home.
During his last court appearance, state prosecutors were instructed to provide Mr Edwards' lawyer with additional documents.
He is charged with the wilful murders of Jane Rimmer, 23, and Ciara Glennon, 27, after allegedly abducting the women off the street in Claremont in 1996 and 1997 respectively.
He is also accused of raping a 17-year-old girl in Claremont in 1995 and the indecent assault of an 18-year-old woman in a Huntingdale home in 1988.
Mr Edwards was 27 and 28 when Ms Rimmer and Ms Glennon were found dead.
He has not been charged in relation to the suspected murder of Sarah Spiers after she disappeared from a nightclub in Claremont in 1996.
Her body has never been found and the investigation into her disappearance is ongoing.
The hunt for the Claremont serial killer has become Australia's longest running and most expensive murder investigation with more than 3000 people investigated under the 'Task Force Macro' operation.