In June 2026, a NSW coroner heard evidence about the 2020 killing of 10-year-old Bridgette "Biddy" Porter—a death that set off not criminal prosecution but a sustained public campaign demanding accountability for the mental health system that failed to intervene.

Porter was killed by a teenager she trusted while alone with that person in a house. The teenager was found not criminally responsible, a legal verdict under NSW law that means the court determined the accused was so mentally unwell at the time of the killing that they did not understand the nature or wrongfulness of their act. No conviction. No prison sentence. That legal outcome—rather than the killing itself—became the flashpoint for community outrage and advocacy.

The coronial inquest took place June 15–19, 2026. Advocacy Australia's Justice for Biddy Porter campaign had launched in July 2024 and formally petitioned for an inquest in October 2024. Under NSW law, coronial inquests exist explicitly to identify ways to prevent future deaths—and the coroner's investigation focused on circumstances surrounding Porter's death and whether similar knife killings could be prevented.

What the Inquest Heard

Evidence revealed a pattern of warning signs before the killing. ABC News reported that the teenager said she had not felt real and had heard voices before the killing—symptoms consistent with dissociative episodes and command hallucinations, which are recognised signs of acute psychosis.

The most significant testimony came on June 17 from the teenager's mother. The Guardian reported she told the inquest she had not understood mental health before her daughter—who was experiencing acute psychosis—killed another child. She also disclosed that her daughter had told her she thought about killing people "all the time." That disclosure became central to the inquest's inquiry into whether the death could have been prevented.

The mother's evidence raises critical questions the coroner must weigh: Was that information ever conveyed to clinicians? Were mental health services engaged? If so, did they respond adequately? A child disclosing homicidal thoughts to a parent without mental health literacy is not merely a parenting issue—it reflects a diagnostic and triage failure by any system responsible for that child's care.

Why This Inquest Matters

Coronial inquests in NSW are inquisitorial rather than adversarial—the coroner is not determining criminal guilt. Instead, the coroner finds facts about the identity of the deceased, date, place, and cause of death, and may make recommendations under Section 82 of the Coroners Act 2009 (NSW) to prevent future deaths. The inquest's specific focus on knife killings suggests recommendations may extend to mental health screening for young people, mandatory reporting rules, and how government agencies share information about at-risk children.

The "not criminally responsible" verdict that concluded the criminal case could not, and legally cannot, assess whether the mental health system functioned adequately before the killing occurred. That is precisely the territory a coroner can investigate. Whether or not criminal accountability was possible, the family and advocacy campaign have forced these questions into the public record—a core function of the coronial process.

Findings are expected months after the inquest concludes, and they will draw close attention from child safety advocates, mental health professionals, and NSW policymakers, all of whom will face pressure to act if the coroner identifies systemic failures.