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Key Points
- Chief Justice Peter Quinlan sentenced the offenders in the WA Supreme Court on Friday.
- Cassius Turvey died in hospital 10 days after he was deliberately struck to the head in October 2022.
- Three men involved in the boy’s murder will serve jail sentences.
Four days later, Brearley and his co-accused allegedly armed themselves with metal poles pulled from shopping trolleys before climbing into Palmer’s ute and driving off to search for youths before they came across Cassius.

Sentences have been handed down for those involved in the death of 15-year-old Cassius Turvey. Credit: NITV News
The trial had heard Brearley had said in a phone call that Cassius had “learnt his lesson” and outside court on Friday, Turvey said “well he has learned a life lesson now”.
MacKenzie received two years and six months and will be eligible for parole in November.

There was an outpouring of community sentiment in the Perth suburb of Midland following the murder of local teenager Cassius Turvey. Source: AAP / Asron Bunch
Turvey said the sentences did not change what had happened.