Warnbro teenager Aaron Pajich may have been killed a week before his body was discovered underneath a concrete slab in the backyard of an Orelia house, a court heard on Thursday morning.
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The 18-year-old's body was discovered in a shallow grave at a Broughton Way home on Monday after the Major Crime Squad was called into investigate his disappearance.
Mr Pajich, who had Asperger's syndrome, was reported missing by his family last week, with the last confirmed sighting of him in Rockingham on Monday, June 13.
It has now emerged he may have been killed that day.
His likely death on June 13 was raised at Perth Magistrates Court on Thursday morning, as 25-year-old Jemma Lilley, made a brief appearance facing a murder charge.
She made no application for bail and was ordered to re-appear at Stirling Gardens Magistrates Court on June 29.
A second woman, 45-year-old Trudi Lenon, also appeared later on Thursday morning, where she too was remanded in custody.
She made no application for bail and will be back at Stirling Gardens Magistrates Court on June 29.