The key problem in the qualification of crimes against life is the systemic complexity of differentiating murder committed in a state of affect (temporary insanity/passion) from intentional murder (including those motivated by revenge or committed during an altercation). In practice, the boundary between sudden intense mental agitation (physiological affect) and ordinary emotional excitement or planned intent often remains blurred. Mistakes by investigators and courts in assessing the duration of the psychotraumatic situation and the trigger actions of the victim lead either to unjustifiably harsh punishment for individuals acting in a state of affect, or, conversely, to the unwarranted mitigation of liability for intentional crimes. The purpose of the article is a comprehensive legal, psychological, and forensic analysis of the criteria for affected murder, identification of defects in judicial and investigative practice during its separation from related offenses, and the development of scientifically grounded recommendations for improving normative criteria for assessing sudden intense mental agitation. The study utilizes formal-dogmatic (normative), comparative-legal, and systemic-structural methods, along with a comprehensive analysis of judicial practice materials and the findings of forensic psychiatric and psychological examinations. The analysis revealed that courts often ignore the phenomenon of "cumulative affect" (aggression accumulated due to prolonged domestic violence), erroneously interpreting such actions as premeditated. The necessity of mandatory appointment of a comprehensive forensic psychological and psychiatric examination in all cases where the defendant claims disorientation of consciousness is substantiated. The practical significance lies in minimizing judicial errors in the qualification of violent crimes against life.