Two men were found guilty of murdering an indigenous juvenile who was chased to Jungle Island and slammed with a metal pole.

Another man was convicted of manslaughter and a woman was acquitted for the attack on Cassius Turvey in the eastern suburbs of Perth on October 13, 2022.

Ten days later, the 15-year-old Noongar Yamatji boy died in hospital due to complications related to severe internal injuries, causing anger nationwide.

After three days of deliberation, Jack Steven James Brearley, 24, and Brodie Lee Palmer, 29, were murdered by a jury after three days of deliberation.

Mitchell Colin, 27, was also tried in the Supreme Court of Western Australia for the murder of Cassius, who was not guilty of murder but murder.

Alesha Louise Gilmore, 23, was not guilty by a jury of eight men and four women.

Prosecutor Ben Stanwix told the jury at the start of the fierce 12-week trial that Brearley played a fatal blow while "looking for kids to hunt" as someone smashed his car window.

Palmer allegedly assisted him.

Breley denied that he hit Cassius with a pole, saying he beat him only after the teenager's knife nailed him, and Palmer made a contract, which in turn denied that the two men tried to blame each other during the trial.

The jury was told that the attack on Cassius, who attacked a jungle river near a creek, was "the end of a complex series of events that had nothing to do with him."

They started on October 9, when Brearley, Gilmore and another man “catched two children and snatched them away” and illegally detained them, punched, kicked and stabbed one of them.

The next incident occurred three days later on October 12, when a group of school-age children, “almost certainly retribution” smashed the windows of Breley’s car.

Stanwix told the jury that it was a "tit tat upgrade", and Brearley and Forth then used the car as a weapon to chase the two boys and hit one of them.

The next day, Cassius and a group of about 20 classmates headed to the same area by bus to watch the battles talked about on social media.

Brearley, Forth and Palmer intercepted them near the field, and in a series of events, Brearley was cut with a knife and another boy hit the face with a metal pole.

Cassius and some other "feared primary school students" escaped to the nearby jungle area.

"Casius hasn't reached the fence yet," Stanvix said.

"He was caught, hit the ground, and deliberately hit the head with a metal pole."

Cassius was hit at least twice, the impact splitting his ears in half and causing bleeding in his brain.

His death shocked the community, with some, including Prime Minister Anthony Albanese, describing the attack as racial motive, although Stanwix said in his opening remarks that it was not.

All in all, the five defendants face 21 charges in the October 9 and 13 incidents.

The jury found that they had committed crimes besides Gilmore's murder charges and theft charges faced by Brearley.