Background
XK was charged with murdering her two children, aged 11 and 9, after stabbing them at their home on 9 or 10 September 2024. She then made serious attempts to take her own life. The children’s father found her the next day; XK told him that she had killed the children.
XK pleaded not guilty on the basis of mental health impairment. The Crown and XK jointly applied under s 31 of the Mental Health and Cognitive Impairment Forensic Provisions Act 2020 (NSW) for special verdicts of act proven but not criminally responsible. Although the parties agreed, the Court required further psychiatric evidence before deciding whether the statutory defence was established.
The Court’s Holding
Cavanagh J entered special verdicts on both murder charges: the acts were proven, but XK was not criminally responsible. The Court found that, when she killed the children, XK had severe major depressive disorder with psychotic-level nihilistic thinking and could not reason with a moderate degree of sense and composure about whether the acts were wrong, as required by s 28(1)(b).
The Court accepted that XK knew the nature and quality of what she was doing. But the unanimous psychiatric evidence established that her severe depression so distorted her judgment that she believed her children would be better off dead in a bad world. Her planning and internet searches did not displace that conclusion; they reflected the pervasiveness of her disordered thinking. XK was ordered detained at a location to be determined by the Mental Health Review Tribunal, as a forensic patient, until released by due process of law.
Key Takeaways
- A joint Crown-defence application does not itself establish the mental health impairment defence; the Court must independently be satisfied on the evidence.
- A person may know the physical nature of an act but still lack criminal responsibility if mental illness prevents rational and composed reasoning about its wrongfulness.
- A special verdict of act proven but not criminally responsible does not mean immediate release; the person may be detained and supervised as a forensic patient.
Why It Matters
The decision illustrates the NSW statutory test for mental health impairment in its “wrongfulness” limb. It confirms that severe depressive illness can satisfy that test even without a conventional, clearly articulated delusion, where the evidence shows psychotic-level distortion of judgment and loss of perspective.
It also underscores the protective function of the forensic-patient regime: the finding removes criminal responsibility but places continuing detention, treatment and any future release under Mental Health Review Tribunal supervision.