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Woman says she ‘didn’t understand mental health’ before daughter experiencing acute psychosis killed another child

A coronial inquest has begun into the death of 10-year-old Biddy Porter, killed in 2020 by a teenager found not criminally responsible due to schizophrenia. The inquest is probing potential systemic failures, including the killer's mother's lack of understanding of mental health.

By Tertius News AI Desk 2 outlets · 2 articles Version 1 Coverage Jun 16–17, 2026 Published Aug 14

Lead

A coronial inquest has commenced into the death of 10-year-old Bridgette "Biddy" Porter, who was killed in rural New South Wales in 2020. The inquiry, granted after Biddy's parents campaigned for a formal investigation, is examining whether systemic failings contributed to the tragedy.

Coverage Comparison

Coverage from ABC Australia and The Guardian provides complementary details. ABC Australia focuses on the commencement of the inquest and the emotional testimony from counsel assisting, while The Guardian emphasizes the killer's mother's lack of understanding of mental health and her consultation with a naturopathic herbalist. Both outlets report that the killer was found not criminally responsible due to mental illness.

Key Claims

A 14-year-old girl killed 10-year-old Biddy Porter at a property in rural New South Wales on July 8, 2020. The killer was found not criminally responsible by the NSW Supreme Court in 2021 due to schizophrenia and acute psychosis.
The killer's mother told the inquest she "didn't understand mental health" and that it "was never on my radar," explaining why she did not seek professional help for her daughter despite concerns.
Two weeks before the killing, the teenager confessed to her mother that she thought about killing people "all the time," as reported by The Guardian.
The killer had a history of self-harm, an interest in knives, and had killed six chickens on the family property in June 2019. After this incident, her parents removed her bedroom door and broke a video game, but did not seek mental health support.
The inquest is examining whether there were "systemic failings or early warning signs" in the lead-up to Biddy's death, according to counsel assisting Peggy Dwyer SC.
Biddy's parents had campaigned for an inquest after a request for a coronial investigation was denied in 2023. The inquest was granted in 2024.
The killer, referred to as XR in proceedings, has been detained in a forensic health facility and is overseen by the mental health review tribunal.

Perspectives

Parents' Perspective: Biddy's parents, Rebekah Keukenmeester and Dominic Porter, sought the inquest to obtain answers about the circumstances leading to their daughter's death, as indicated by ABC Australia's report.

Legal Perspective: Counsel assisting the coroner, Peggy Dwyer SC, emphasized the trauma of Biddy's death and the need to explore systemic failures, noting the impact on the family is "simply incalculable."

Public Interest Perspective: The case highlights concerns about mental health awareness and support for young people, particularly in rural areas. The mother's statements underscore a lack of understanding that may be common in some communities, prompting calls for better education and resources.

Additional Context

The inquest continues to hear evidence, with reports indicating that the killer was given escorted day release from a facility, which prompted Biddy's parents to push for a coronial inquest. The full scope of the inquiry is expected to include examination of mental health services and early intervention opportunities.

How each outlet told it

ABC Australia as of Jun 16, 2026, 5:46 AM UTC

Framing: Coronial inquest into the murder of a 10-year-old girl — Emotive/investigative

Facts Included:

A coronial inquest into the murder of a 10-year-old girl has commenced
The victim's name was Biddy Porter
The killer was found guilty but not criminally responsible
The killer had a history of mental health concerns
The inquest is examining possible systemic failings

Read the source article →

The Guardian — World as of Jun 17, 2026, 5:45 AM UTC

Framing: Mother's lack of understanding of mental health — Neutral/investigative

Facts Included:

A 14-year-old girl killed a 10-year-old girl in rural New South Wales
The killer was found not criminally responsible due to mental illness
The killer's mother did not understand mental health and consulted a naturopathic herbalist
The killer had schizophrenia and was in acute psychosis at the time of the killing
The killer had a history of self-harm and a fascination with knives

Read the source article →

What was claimed, and who backed it

Each row is one claim, attributed to the outlet whose wording states it most clearly. Confidence rates how directly the source text states the claim — explicit and unhedged rates high; hedged, pieced-together, or internally inconsistent statements rate lower. It does not measure whether the claim is true. Status counts the distinct outlets we found asserting it — so a single-source claim can still show high confidence, and a multi-source claim can show medium. Every one of those outlets is named beside the status, so you can check the count against the list. For claims extracted before we began storing that list, the row says so: it names the outlet the claim is quoted from and states that we have not recorded which outlets backed it. Outlets wrote at different times, so a figure that evolves — a casualty count, for example — can legitimately differ between rows; check the "as of" time next to each claim's source.

Claim	Confidence	Status
ClaimA 14-year-old girl killed a 10-year-old girl in rural New South Wales. The victim's name was Biddy Porter.	ConfidenceHigh	StatusMulti-source quoted from The Guardian — World as of Jun 17, 2026, 5:45 AM UTC the outlets behind this status were not recorded for this claim
ClaimThe killer was found not criminally responsible due to mental illness.	ConfidenceHigh	StatusMulti-source quoted from The Guardian — World as of Jun 17, 2026, 5:45 AM UTC the outlets behind this status were not recorded for this claim
ClaimThe killer's mother did not understand mental health and consulted a naturopathic herbalist about concerns for her teenage daughter.	ConfidenceHigh	StatusSingle-source via The Guardian — World as of Jun 17, 2026, 5:45 AM UTC
ClaimThe killer had schizophrenia and was in acute psychosis at the time of the killing.	ConfidenceHigh	StatusMulti-source quoted from The Guardian — World as of Jun 17, 2026, 5:45 AM UTC the outlets behind this status were not recorded for this claim
ClaimThe killer had a history of self-harm and a fascination with knives.	ConfidenceHigh	StatusMulti-source quoted from The Guardian — World as of Jun 17, 2026, 5:45 AM UTC the outlets behind this status were not recorded for this claim
ClaimA coronial inquest into the murder of Biddy Porter has commenced, examining possible systemic failings in the lead-up to her killing.	ConfidenceHigh	StatusMulti-source quoted from ABC Australia as of Jun 16, 2026, 5:46 AM UTC the outlets behind this status were not recorded for this claim
ClaimBiddy's parents had campaigned for an inquest after a request for a coronial investigation was denied in 2023.	ConfidenceHigh	StatusSingle-source via ABC Australia as of Jun 16, 2026, 5:46 AM UTC
ClaimThe killer was given escorted day release from a facility, prompting Biddy's parents to push for a coronial inquest.	ConfidenceHigh	StatusSingle-source via ABC Australia as of Jun 16, 2026, 5:46 AM UTC

Transparency & Audit Trail

2 outlets · 2 articles consulted: ABC Australia, The Guardian — World 8 claims extracted Version 1 Written 2026-08-14