▁become ▁ill ▁witness ing ▁the ▁execution . ▁ ▁This ▁provided ▁momentum ▁for ▁the ▁movement ▁to ▁replace ▁the ▁gas ▁chamber ▁with ▁le th al ▁injection , ▁and ▁in ▁November ▁of ▁that ▁year , ▁Arizona ▁vot ers ▁approved ▁the ▁change ▁in ▁method , ▁although ▁prisoners ▁sent enced ▁to ▁death ▁prior ▁to ▁November ▁ 1 5 , ▁ 1 9 9 2 , ▁could ▁still ▁choose ▁the ▁gas ▁chamber . ▁Hard ing ▁thus ▁became ▁the ▁last ▁prisoner ▁executed ▁in ▁Arizona ' s ▁gas ▁chamber ▁without ▁having ▁le th al ▁injection ▁as ▁an ▁option ▁( W alter ▁La Gr and , ▁who ▁was ▁sent enced ▁to ▁death ▁in ▁ 1 9 8 2 , ▁was ▁executed ▁in ▁the ▁gas ▁chamber ▁at ▁his ▁request ). ▁ ▁See ▁also ▁▁ ▁Capital ▁pun ishment ▁in ▁Arizona ▁ ▁Capital ▁pun ishment ▁in ▁the ▁United ▁States ▁ ▁List ▁of ▁people ▁executed ▁in ▁Arizona ▁ ▁References ▁ ▁S ources ▁▁ ▁In mate ▁ 0 4 3 2 5 5 ▁Hard ing ▁Donald , ▁E . ▁Arizona ▁Department ▁of ▁Cor re ctions . ▁Retrieved ▁on ▁ 2 0 0 7 - 1 1 - 1 2 . ▁ ▁Arizona ▁Death ▁Pen alty ▁History . ▁Arizona ▁Department ▁of ▁Cor re ctions . ▁Retrieved ▁on ▁ 2 0 0 8 - 0 1 - 1 0 . ▁ ▁Exec ution ▁P ace ▁Cl im bs ▁As ▁App e als ▁Run ▁Cour se . ▁The ▁New ▁York ▁Times ▁( 1 9 9 2 - 0 3 - 2 7 ). ▁Retrieved ▁on ▁ 2 0 0 7