First-degree murder is a serious crime that involves the intentional and premeditated killing of another person. This means that the person planned the murder ahead of time, showing a clear intent to cause death. It is considered one of the most severe types of homicide and often carries harsh penalties, including life imprisonment or even the death penalty in some jurisdictions. To be charged with first-degree murder, prosecutors must prove that the accused had a specific motive and acted with malice aforethought. This distinguishes it from other types of homicide, such as second-degree murder or manslaughter, where the intent or planning may not be as clear.