[Page 1691]Homicide, the intentional killing of another person, is the 3rd leading cause of death in the United States for those between the ages of 15 and 34 years and the 15th leading cause of death across all ages. Across history and across cultures, people have believed that homicide is often related to mental health disorders. By the mid-2010s, high-profile mass shootings heightened public concern regarding homicidal violence and strengthened the popular perception that homicide is often a function of mental health disorders. In 2013, half of the general population believed that those with a serious mental health disorder were far more dangerous than the general population. Empirical research examining the relation between psychopathology and homicide indicates that popular perceptions are accurate—at least to some ...