1. a person who commits murder; one who unlawfully kills another human being with premeditation

Examples

• The murderer was sentenced to life in prison.
• Police are still searching for the murderer who escaped.
• The detective gathered evidence to identify the murderer.
• She testified against her husband’s murderer in court.
• The serial murderer was finally caught after years of investigation.
• Witnesses helped police catch the murderer at the scene.