This study aims to analyze the application of criminal law in murder cases with a focus on the decision of case Number 454/Pid.B/2024/PN in Surabaya. This case involves the application of Articles 338 and 340 of the Criminal Code (KUHP) related to unplanned murder and premeditated murder. This study uses normative legal research methods with a legislative approach and a case approach. The results of the study show that the judge has carefully considered the existing evidence and sentenced in accordance with the applicable legal provisions. Although the defendant claimed self-defense, the judge considered that there was not enough evidence to support the claim. The impact of the verdict on the perpetrator provides a deterrent effect and serves as a warning to the public about the severe legal consequences for the crime of murder. Meanwhile, although the victim's family is satisfied with the court's decision, they still feel a loss that cannot be replaced by any punishment. This study concludes that even though the judicial process has been carried out in accordance with the applicable procedures, there is still room for improvement in terms of the time given to the defense and attention to the psychological condition of the perpetrator
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