by lethal injection, the prisoner is strapped to a gurny and 3 diffrent medications are injected into the prisoner. The first one is an anesthetic which relaxes the prisoner, the second is pancuronium bromide which is a paralytic agent , and the third is potassium chloride which causes the heart to stop beating.
Some die from old age by the time they exhaust their final appeals! Most states with the death penalty use lethal injection. It is supposed to be the least painful way of execution. Too bad the victims didn't go that way!