A coronial inquest examining the 2020 killing of 10-year-old Bridgette "Biddy" Porter convened at the NSW Coroners Court from June 15–19, 2026, with testimony illuminating the mental health crisis that preceded her death and the systemic gaps that may have enabled it.

Porter was killed in NSW in 2020 by a teenager she trusted, while left alone with that person in a house. The killer was subsequently found not criminally responsible — a special verdict under NSW law that requires the court to be satisfied the accused was mentally ill at the time of the offence to the point of not knowing the nature or wrongfulness of their act. No conviction followed. No custodial sentence was imposed. That legal outcome, not the killing itself, became the gravitational centre of community outrage and the impetus for a sustained advocacy campaign.

Advocacy Australia's Justice for Biddy Porter campaign launched on 1 July 2024 with an NSW Parliament e-petition, and petitioners formally requested an inquest on October 17, 2024. The coronial process — which in NSW carries the explicit statutory function of identifying ways to prevent future deaths — was granted, with the inquest's terms of reference focused on circumstances surrounding Porter's death and the prospect of preventing similar knife killings.

What the Inquest Heard

Evidence placed before the inquest cut to the core of the pre-incident warning signs. ABC News reported that the killer claimed to have not "felt real" and to have heard voices before the killing — symptomatology consistent with dissociative episodes and command hallucinations, both recognised features of acute psychotic states.

The most significant testimony on June 17 came from the killer's mother. The Guardian reported she told the inquest she had not understood mental health before her daughter — described as being in acute psychosis — killed another child. She also disclosed that her daughter had told her she thought about killing people "all the time." That disclosure, and what was or was not done with it, sits at the centre of the inquest's inquiry into preventability.

The mother's evidence raises questions the coroner will need to weigh carefully: whether the information was ever conveyed to clinicians, whether services were engaged, and, if so, whether they responded adequately. A child disclosing homicidal ideation to a parent who lacked the literacy to recognise its severity is not an individual failure alone — it is a diagnostic and triage failure by any system that should have been holding that child's care.

The Broader Stakes

Coronial inquests in NSW are inquisitorial, not adversarial. The coroner is not finding criminal guilt; findings go to identity of the deceased, date, place, and cause of death, and — critically here — recommendations to prevent future deaths under Section 82 of the Coroners Act 2009 (NSW). The inquest's explicit framing around knife killings signals that any recommendations are likely to extend beyond this single case into areas such as mental health screening for young people, mandatory reporting obligations, and interagency information-sharing protocols.

The "not criminally responsible" verdict that closed the criminal proceedings did not, and legally could not, address the adequacy of the mental health system before the killing. That is precisely the terrain a coroner can map. Whatever findings emerge, the family of Bridgette Porter and the advocacy campaign behind this inquest have already forced those questions into the public record — a function of the coronial process that operates independently of whether any criminal accountability was possible.

The inquest was scheduled to conclude on June 19, 2026. Findings, which may take months to be handed down, will be closely watched by child safety advocates, mental health clinicians, and the NSW government, all of whom will face pressure to act if the coroner identifies systemic failures.