The son accused of murdering his mother Deann Ashby in Mosman Park allegedly began his fatal assault by hitting her over the head with frying pan as she cooked his dinner.
Samuel Ashby, 39, made a brief appearance at Perth Magistrates Court this morning, charged with the murder of his 68 year-old mother at her Bond Street home on Sunday night.
Mr Ashby was remanded in custody for a week to receive treatment at the Frankland Centre, the secure wing of Graylands Hospital.
His lawyer Billy Harris told the court how Mr Ashby had allegedly hit his mother "unexpectedly" with the heavy frying pan.
Police will allege he then attacked her several times, causing severe injuries to her head and neck.
Mr Ashby will return to court next week, after a nurse assessed him as needing psychiatric treatment.
Outside court, Mr Harris said Mr Ashby was "really not very well", but would not discuss the case or allegations further.
Neighbours had earlier said they understood the 68-year-old's husband John, better known as Jack, had gone away for the weekend, leaving Mrs Ashby alone in the house.
Nearby resident Sara told The West Australian she heard several chilling screams coming from the home shortly after 6.40pm.