An Alabama death row inmate who raped and murdered a woman in 1991 was executed this week using nitrogen gas, making him the fourth person in the U.S. to die by the controversial method.

Frazier was convicted of capital murder for breaking into a Birmingham woman's apartment, stealing cash, raping her at gunpoint, and killing her.

Demetrius Frazier, who was put to death in Alabama, criticized Democrat Michigan Gov. Gretchen Whitmer in his final words, reports say.