Which index crime involves the unlawful, intentional killing of a person?

Murder is classified as an index crime because it involves the unlawful, intentional killing of another person. This definition encapsulates both the legal elements of homicide and the societal impact of this crime, which is significant enough to warrant attention in crime statistics. Murder is distinguished by its intent to kill, setting it apart from offenses like robbery, rape, or motor vehicle theft, which do not inherently involve taking another person's life. Understanding the severity and implications of murder as a crime highlights its classification in criminology and law enforcement measures.