Cassius Turvey, a 15-year-old Noongar Yamatji boy, died in a hospital 10 days after an incident in Perth's eastern suburbs on October 13, 2022.
Brodie Lee Palmer, 29, Mitchell Colin Forth, 26, Jack Steven James Brearley, 23, and Aleesha Louise Gilmore, 23, pleaded not guilty to murdering him.
They face a massive 11-week jury trial in the West Australian Supreme Court, which is set to start on Monday.
Chief Justice Peter Quinlan will preside over the high-profile case that is expected to hear from dozens of witnesses.
The group are also facing trial for several other charges they have denied.
Brearley, Forth and another man named Ethan Robert MacKenzie, 20, pleaded not guilty to unlawfully detaining and assaulting another boy on October 9, 2022.Â
MacKenzie will stand trial at the same time as the other accused. Gilmore denied unlawfully detaining the same teen on that day.
Brearley, Forth, Gilmore and MacKenzie denied unlawfully detaining a third person on that day.
Brearley and Palmer have also denied stealing a hat and crutches on October 13. Brearley, Palmer, Forth and Gilmore also denied assaulting another person on that day.
Cassius has been remembered as a loving son and a role model to his friends. He had started his own lawn-mowing business and was invited at the age of 11 to deliver an acknowledgement of Country at WA's parliament.
Palmer, Forth, Brearley and Gilmore previously pleaded not guilty to murdering Cassius in a lower court in 2023.
All remain in custody.
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