An autistic Perth man has been convicted of murdering his mother whose body has never been found.
Brent Donald Mack, 27, was on trial in the WA Supreme Court accused of murdering his mother, Ah Bee Mack, between December 18 and 29, 2008.
Ms Mack, 56, who also went by the name of Pauline, was last seen alive in September 2008, but her body has never been found.
In a police interview earlier this year, Mack claimed his mother had committed suicide and had asked him not to tell anyone.
However, prosecutors alleged Mack killed his mother for her money and property.
Justice John McKechnie, who presided over the case without a jury, returned a guilty verdict on Friday.
Mack stood in the dock and kept his head down during the proceedings, as he has done during most of his trial and court appearances.
Justice McKechnie described Mack as "unusual" and ordered both a psychiatric and psychological report ahead of sentencing.
A life sentence would be "almost inevitable", Justice McKechnie said.
Mack will be sentenced on January 25.