A man has admitted to murdering mother of two Helen Rocha, whose remains were found in the backyard of a Parmelia house months after she went missing last year.
Keith Edward Earnshaw pleaded guilty to the murder of Mrs Rocha on September 26 last year, the day she was last seen alive.
He will be sentenced later this year.
Forensic officers had first searched Earnshaw's home last October while investigating the mother-of-two's disappearance.
She was last seen leaving her Willagee home with a man in a white hatchback.
Police allege Mr Earnshaw was the man who picked her up the day she vanished.
The devoted mother was not seen since after that, failing to contacted her teenage son and daughter, touch her bank account or use her mobile phone.
After her disappearance police also searched a southern suburbs rubbish tip, bush near Kwinana train station, Parmelia and Kwinana bushland and scrub near St Vincent Primary School.
Mrs Rocha's body was eventually found in February this year.