【法】 principal murderer

謀殺的英語翻譯：

killing; murder
【法】 calculated homicide; commit murder; criminal homicide
deliberate murder; moerda; premeditated homicide; premeditated murder
wipe out

主犯的英語翻譯：

prime culprit; principal
【法】 chief culprit; main culprit; major offender; primary culprit
principal offender