Man accused of murdering Perth teenager Cassius Turvey facing more charges

WARNING: Aboriginal and Torres Strait Islander viewers are warned this story contains images of a deceased person.

The man accused of the murder of Perth teenager Cassius Turvey is facing additional charges.

Cassius, a 15-year-old Noongar boy, was allegedly ambushed while walking home from school in Middle Swan with friends and later died in hospital.

Jack Brearley, 21, has been charged with murder, and is now facing two more charges - aggravated assault occasioning bodily harm and stealing.

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These relate to the alleged assault of a 13-year-old boy Cassius was walking home with, Western Australian Police Commissioner Col Blanch said today.

"It's alleged he struck the 13-year-old across the face with a metal pole," Blanch said.

The boy was on crutches and it will be alleged Brearley, stole those from the teenager.

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Blanch said police are still speaking to others who may have been involved in the attack or present at the time, but the investigation is still underway.

"(We've) spoken to a number of people we believe present," he said.

"There may be other charges coming forward. I don't want to say any more than that, other than the investigation is ongoing."

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Blanch defended comments he made on 6PR radio earlier this week about Cassius being in the "wrong place at the wrong time".

"Cassius was the innocent victim of a violent attack," he said.

"Justice for Cassius is my first priority."

When pressed on more details about whether the alleged attack on Cassius was racially motivated, Blanch would not be drawn.

He said he wanted the court to do its job and would not be put in a position to jeopardise the legal process.