T This study examines two primary issues: first, the legal analysis of the criminal offense of defamation in relation to the delayed execution of supreme court decision number 287 k/pid/2019; and second, the analysis of the public prosecutor\\\'s authority regarding the execution of said cassation decision against the perpetrator of defamation, as governed by the criminal procedure code (kuhap). while the execution of a cassation decision that has acquired permanent legal force (*inkracht van gewijsde*) falls under the exclusive authority of the public prosecutor pursuant to article 270 of the kuhap, in practice, delays occur—as exemplified by supreme court decision number 287 k/pid/2019. this normative legal study, employing a descriptive-analytical approach, aims to analyze the delay in executing the defamation case judgment and the authority of the public prosecutor\\\'s office within the framework of the kuhap. the findings indicate that the execution delay stemmed from administrative-procedural obstacles—such as delays in the delivery of the judgment copy—as well as factual impediments regarding the whereabouts of the convicted person and the filing of a judicial review (*peninjauan kembali* or pk). the absence of a clear statutory deadline for delivering the copy of the cassation decision hinders the public prosecutor\\\'s office in its role as the executing authority, undermines the principles of speedy, simple, and low-cost judicial proceedings, and diminishes both legal certainty (*rechtssicherheit*) and substantive justice.