A "murderer" is an individual who unlawfully kills another person with intent. This act is considered one of the most serious crimes in many legal systems around the world. The motivations for murder can vary widely, including personal disputes, financial gain, or psychological issues. In legal terms, murder is often classified into different degrees, such as first-degree murder, which involves premeditation, and second-degree murder, which may occur in the heat of the moment. The consequences for being convicted of murder can include long prison sentences or, in some jurisdictions, the death penalty.