Homicide and mental disorder — structured clinical viva

Myth vs reality. High-profile killings drive community-care failure narratives; epidemiology shows low absolute risk and that most homicide is not by current patients. National survey order-of-magnitude: about one-third lifetime mental disorder among convicts; schizophrenia lifetime a small minority (~5% order).[1][2]

FEP concentration. Among psychotic homicides, a large fraction occur before first treatment — prevention and early intervention are structural themes; family victims are common relative to strangers.[3]

Pathways. Psychosis-driven; substance/dual diagnosis (major contributor in national homicide series); personality-antisocial instrumental; domestic; filicide (mental illness not universal; mothers more often ill than fathers); homicide-suicide (depression and relationship pathology high-yield).[4][5][8]

Victimology. People with mental illness are also over-represented as homicide victims — bidirectional safety framing.[6]

Responsibility opinion. Multi-source reconstruction at material time; nexus to local legal limbs; diagnosis ≠ defence; address substances and malingering; jurisdiction-specific labels without invented sections.[7]

Temporal triad. Responsibility then; fitness now; risk future.[7]

1. Cite absolute-risk humility, national survey proportions, and the divergence between media salience and base rates; note prevention focuses on untreated FEP, substances, and known dynamic risk — not mass detention of all SMI patients.[1][2][3]
2. Substance pathway may dominate or co-drive; reconstruct timeline; many jurisdictions limit complete mental-condition defences when intoxication is self-induced — principles only; still treat and manage future dual-diagnosis risk.[4][7]
3. Filicide series: most cases not solely "schizophrenia stranger" stories; maternal mental illness and affective pathways more prominent than in stranger psychotic homicide teaching cases.[5]
4. Instruments may later inform group-level future risk for leave/supervision; they do not decide past criminal responsibility or replace legal-limb analysis.[7]