What is it about?
This study describes a real case of a 17-year-old who carried out a violent attack while experiencing his first episode of psychosis. By combining interviews, clinical data, and official records, the study examines how mental health symptoms, personal struggles, and life events developed over time and contributed to the incident. It highlights early warning signs such as social withdrawal, unusual beliefs, growing anger, and fascination with violence. The findings show that serious violence does not happen suddenly but often follows a gradual buildup of psychological distress and behavioural changes. Understanding these patterns can help professionals identify risks earlier and intervene before harm occurs.
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Why is it important?
This study is important because it links early symptoms of psychosis with observable warning behaviours before severe violence. It shows that focusing on changing behaviours and mental states, rather than waiting for a formal diagnosis, can improve threat assessment. The findings support earlier detection and intervention, especially in young people, and highlight missed opportunities where action might have prevented escalation. This has direct implications for schools, clinicians, and threat assessment professionals working to prevent rare but high-impact violent events.
Perspectives
This case has stayed with me since my early training in psychotherapy. Even after setting the work aside for some time, the client’s story continued to shape how I think about risk, mental illness, and early intervention. It is one of those cases that leaves a lasting impression and continues to influence clinical judgment long after the work itself is completed. Bringing this study to publication was important to me, both out of respect for the client’s trust and because I believe the case offers meaningful insights for forensic mental health and threat assessment. It also reflects how much can be learned from individual cases when we take the time to examine them carefully.
Andrea Canel
University of Basel
Read the Original
This page is a summary of: Attempted mass murder during first-episode psychosis: A case study., Journal of Threat Assessment and Management, March 2026, American Psychological Association (APA),
DOI: 10.1037/tam0000271.
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