A 15-year-old girl has become the fourth person charged in relation to the death of Perth mother-of-three, Peta Fairhead, who was dumped and left for dead outside Joondalup Hospital in the early hours of August 3.
Police will allege the girl, from Connolly, lured Ms Fairhead and two men to a Ridgewood house hours before Ms Fairhead died.
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"Upon their attendance, the three had personal items stolen while being threatened with weapons," a police spokeswoman said.
"The girl has been charged with three counts of aggravated armed robbery and will appear before the Joondalup Children's Court on 6 September 2016."
Earlier this month, three men, aged 19 and 20, were charged with Ms Fairhead's kidnapping and murder.
Ross Boag, Lucas James Yarran and Leroy Daniel Smith are accused of storming the Ridgewood home where Ms Fairhead was and stealing her jewellery and mobile phone while threatening her and being armed with a baseball bat and machete.
They are accused of afterwards pushing Mrs Fairhead out of a car with significant injuries and leaving her to die outside the emergency unit of Joondalup Hospital about 3.15am on Wednesday.
She leaves behind two young sons and a daughter.