Cleveland Dodd was found unresponsive inside a cell in Unit 18, a youth wing of the high-security adult facility Casuarina Prison, in the early hours of October 12, 2023.
The 16-year-old was taken to hospital in a critical condition and died a week later, causing outrage and grief in the community.
A long-running inquest in Perth plans to hear from Cleveland's mother Nadene Dodd on Wednesday.
A photo of Cleveland will be displayed in court and her statement will be read by a friend before Coroner Philip Urquhart releases his provisional recommendations for the matter.
Cleveland Dodd fatally self-harmed in a youth wing of high-security adult facility Casuarina Prison. (Aaron Bunch/AAP PHOTOS)
On Tuesday, WA Deputy Corrections Commissioner Christine Ginbey's lawyer, Grant Donaldson SC, renewed his allegations of bias against the court.
It followed evidence from the Department of Justice's communications director Sue Short, who spent about an hour in the witness box mostly answering questions about a Unit 18 promotional video she had worked on with Ms Ginbey.
In October, Ms Ginbey attempted and failed to have Mr Urquhart disqualify himself from the case based on apprehended bias.
Mr Donaldson at the time told the court Ms Ginbey, who was deputy commissioner for women and young people when Cleveland died, was the subject of undue focus and had been bullied while giving evidence.
Ms Ginbey hired Mr Donaldson in July.
The decision followed Mr Urquhart ordering her to appear in court within hours to give evidence after a slew of late documents linked to her were provided by Department of Justice lawyers to counsel assisting Anthony Crocker.
The department's former director-general Adam Tomison also repeatedly linked Ms Ginbey to Unit 18, including a ministerial document he agreed contained "grievous" and "blatant" lies, while he was giving evidence in July.
The inquest has previously heard Unit 18 was established with little planning in July 2022, as Corrective Services struggled to cope with a small, disruptive cohort of young detainees at WA's main youth detention centre, Banksia Hill.
Former acting commissioner of corrective services Gary Budge told the court on Tuesday that he and Ms Ginbey had been reviewing alternative sites to Unit 18 in June, and that he thought a women's prison would have been better for children and youths than a men's prison.
But Dr Tomison "had been strong in his decision" when he told him Unit 18 was the chosen site on July 1.
"I don't know how he came to the conclusion ... It was certainly no suggestion of mine," he said in a half-day of testimony where he was unable to recall many of the events in the lead-up to youths being transferred to the unit.
13YARN 13 92 76
Lifeline 13 11 14
Kids Helpline 1800 55 1800 (for people aged 5 to 25)
beyondblue 1300 22 4636
