This article examines online gambling addiction (gambling disorder) in the criminal responsibility of murder offenders under Indonesia’s New Criminal Code, focusing on mens rea, capacity for responsibility, causation, and sentencing. This normative legal study applies statutory, conceptual, case, and comparative approaches using grammatical, systematic, and teleological interpretation and deductive reasoning. The Ahmad Fahrozi case is used only as a factual illustration, not a final judicial precedent. The analysis shows that gambling disorder does not automatically negate intent or criminal responsibility. Its legal significance depends on functional impairment at the time of the offense and its relevance to Articles 38-39, requiring forensic psychiatric assessment. Gambling addiction is therefore better treated as a criminogenic or motivational background factor unless a functional effect on capacity is established. The study’s novelty lies in integrating gambling disorder, criminal causation, diminished responsibility, forensic psychiatric evidence, and individualized sentencing. It contributes a structured framework that avoids treating addiction as an automatic excuse while preserving its relevance when clinically established.
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