Demetrius Frazier was executed Thursday in Alabama for the 1991 rape and murder of Pauline Brown, marking the fourth U.S.

Alabama has carried out the nation’s fourth nitrogen gas execution, putting a man to death for the killing of a woman who was raped and shot during an apartment break-in.

Alabama executed a man on Thursday who was convicted in the 1991 rape, robbery and murder of a Birmingham woman, becoming the fourth person put to death by nitrogen gas.