One of WA's most baffling missing persons cases will be the subject of a coronial inquiry later this year.
The case of missing Nannup mother Chantelle McDougall, her daughter Leela and two other men, Tony Popic and Simon Kadwell, has been investigated by police for almost a decade.
Ms McDougall and her then six-year-old daughter went missing in July 2007, together with her partner Mr Kadwell, 45, and their lodger Mr Popic, 40.
They left behind wallets, credit cards and dirty plates on the table at their Nannup home, 280km south of Perth.
A note reportedly left at the home said they were moving to Brazil. They have never been seen or heard from since.
At a hearing in the WA Coroners's Court on Friday, dates for a coronial inquest into the case were set down for later this year.
The case was listed to be heard at Busselton courthouse from December 6-8.
Over the years it has been reported Mr Kadwell was linked to a sect based on a doomsday book called Servers of the Divine Plan, which called on "servers" to take up their positions on Earth before the world's imminent end and rebirth.
A fresh appeal on the case was made by police in 2013 through the Channel 10 television program Wanted.
In the program, detectives revealed a man calling himself Tony Popic checked into the Underground Backpackers in Northbridge on July 15, 2007.
The next day, the same man is believed to have caught a train from Perth to Kalgoorlie.
Ms McDougall's parents Jim and Cathy also made an impassioned plea through the program to their daughter and grand-daughter.
"We really love you both," Cathy said.
"We would love to just hear if you're OK, and safe and happy, or if you need help, get some message to us and we can help you."
According to the WA Crime Stoppers website their last known residence in Nannup "was discovered abandoned with all their belongings left behind untouched."
"Despite extensive inquiries by police and their families, with known associates, childcare officials and financial institutions, their whereabouts still remains unknown," the site reads.
A WA Police spokesman said on Friday the Missing Persons Unit within the Major Crime Division had carriage of the investigation.
"As it is now before the WA State Coroner, WA Police is not able to comment on the case," the spokesman said.
