Execution of an offender sentenced to death after conviction by a court of law of a criminal offense. Capital punishment for murder, treason, arson, and rape was widely employed in ancient Greece, and the Romans also used it for a wide range of offenses. It also has been sanctioned at one time or another by most of the world's major religions. In 1794 the U.S. state of Pennsylvania became the first jurisdiction to restrict the death penalty to first-degree murder, and in 1846 Michigan abolished capital punishment for all murders and other common crimes. In 1863 Venezuela became the first country to abolish capital punishment for all crimes. Portugal was the first European country to abolish the death penalty (1867). By the mid-1960s some 25 countries had abolished the death penalty for murder. During the last third of the 20th century, the number of abolitionist countries increased more than threefold. Despite the movement toward abolition, many countries have retained capital punishment, and some have extended its scope. In the U.S., the federal government and roughly three-fourths of the states retain the death penalty, and death sentences are regularly carried out in China, Saudi Arabia, Singapore, and Iran. Supporters of the death penalty claim that life imprisonment is not an effective deterrent to criminal behaviour. Opponents maintain that the death penalty has never been an effective deterrent, that errors sometimes lead to the execution of innocent persons, and that capital punishment is imposed inequitably, mostly on the poor and on racial minorities.
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The Columbine High School massacre included some execution-style murders in the library where the two killers, Eric Harris and Dylan Klebold, had shot (or executed) a large number of students after teasing and taunting them for their looks, race or beliefs.
The weapon involved is usually a handgun, though long guns, blunt instruments, and bladed weapons have also been used in killings labeled as execution style. The method is generally understood to presume such a degree of wanton, premeditated evil that any other crimes undertaken during the incident (e.g., robbery, kidnapping, rape) cannot even be considered as motives. In those jurisdictions which still maintain the option of capital punishment, execution-style killings usually qualify the offender for the death penalty.