Donald Eugene Harding (March 1, 1949 – April 6, 1992) was an American serial robber, serial killer, and spree killer who committed at least six murders between December 1979 and January 1980. Harding was executed in 1992 by the state of Arizona by gas chamber for two murders he committed there. Harding became the first person to be executed in Arizona since 1976 when the death penalty was reinstated nationwide. His execution was particularly noteworthy and controversial due to the fact that his death in the gas chamber took eleven minutes and was reportedly gruesome. Harding's execution ultimately provided momentum for the movement to provide Arizona death row inmates with a choice between the gas chamber and lethal injection.