A mass murderer is an individual who kills multiple people in a single event or closely related events. This act typically occurs in a public place and is characterized by the intent to cause widespread harm and fear. The number of victims can vary, but it generally involves at least three fatalities. Mass murderers often have complex psychological profiles and may be motivated by various factors, including personal grievances, ideological beliefs, or mental illness. These incidents can lead to significant societal impacts, prompting discussions about gun control, mental health, and public safety.