Homicide Squad detectives are investigating the deaths of three people at a house in Ellenbrook overnight.
Around 1.30am this morning (15 July 2018), police were called to a convenience store on The Broadway in Ellenbrook after a man had presented there requesting police.
Officers attended the convenience store and after further inquiries, then attended at a nearby residential address in Ellenbrook.
They located a male and female deceased inside the address, and a female in the rear yard with critical injuries.
An ambulance was called, and the female was conveyed to Royal Perth Hospital, but died a short time later.
A 19 year old man, who resides at the address, is currently in custody and is helping police with their inquiries.
Homicide Squad detectives, along with Forensic officers, will remain at the scene today.
Homicide Squad detectives have charged a 19 year old man with three counts of murder as a result of their investigation into the death of an 8 year old boy, a 15 year old girl and their 48 year old mother.
Around 1:30am on Sunday 15 July 2018, Police were called to the house in Ellenbrook.
The 19 year old man from Ellenbrook is due to appear before the Midland Magistrates Court today, 16 July 2018.