Alan Eugene Miller was executed by nitrogen hypoxia in Alabama, marking only the second use of this controversial method in the U.S. Miller, convicted for the 1999 murders of three men, was pronounced dead at 6:38 p.m. on Thursday. The execution has sparked debate over the humaneness of nitrogen hypoxia, with witnesses reporting Miller shaking and gasping for breath before dying. Despite officials claiming the method is humane, critics argue it can cause excessive pain and is akin to torture. Governor Kay Ivey and Attorney General Steve Marshall defended the execution, stating it served justice for the victims. The method, while defended by state officials, has faced criticism from human rights advocates and medical professionals due to its untested nature and potential for causing prolonged distress.