Four individuals charged with the murder of Aboriginal schoolboy Cassius Turvey appear before the WA Australian Supreme Court for a 10-week trial starting Monday.

Jack Steven James Brearley, 23, Brodie Lee Palmer, 29, Mitchell Colin Forth, 26, and Aleesha Louise Gilmore, 22, face charges of murder in relation to the death of the 15-year-old Noongar Yamatji boy.

The incident - on October 13, 2022 – occurred while Cassius was walking home from school in Middle Swan.

The prosecution will allege the defendants, who have all pleaded not guilty to the charges, were directly responsible for the fatal injury sustained by Cassius.

Prosecutors will tell the court Cassius and his friends had walked off their bus about 4.30pm that afternoon and were heading along Patterson Drive when a black Ford Ranger utility allegedly stopped beside them.

It is alleged the defendants approached Cassius and his friends, accusing them of vandalising car windows, before one of the individuals assaulted the 15-year-old with a metal pole.

The assault resulted in serious head injuries, with Cassius initially hospitalised for five days before being discharged.

Shortly thereafter he began to suffer from seizures and strokes and his family subsequently rushed him back to hospital, where he was placed in an induced coma but died a days later.

Several witnesses, including minors, will provide evidence during the high-profile trial, some remotely via video link, before Chief Justice Peter Quinlan.

In the wake of his death, a series of rallies and protests were held across Australia and overseas, including in Aotearoa-New Zealand and Los Angeles.

The demonstrations were not only a response to the violent assault but a show of solidarity with the grieving family of Cassius, who was described as a loving son, an active member of the community and role model to his friends.