An autistic Perth man has been sentenced to life with a 20-year minimum for murdering his mother to get her money.
Brent Donald Mack, 27, was found guilty of killing Pauline Mack, 56, whose body has never been found.
Mrs Mack had not been seen alive since September 2008 and her son had taken hundreds of thousands of dollars from her account.
Mack had repeatedly lied to relatives claiming his mother was alive and living in another suburb but he was charged with her murder in 2010.
Mack later told police he had buried her at Lake Gwelup after she committed suicide at their Mount Hawthorn home.
Justice McKechnie also found there was no causal link between Mack's autism and his crime.
However, he said Mack was a very isolated man with poor skills, and he was at risk of bullying and mistreatment in jail.
He said prison authorities would have to put a special management plan in place to try to stop that happening.
With time already served, Mack will be eligible for release on parole in 2030.