The execution is the 22nd in the U.S. this year and the sixth in Alabama, which has put three of the men to death using nitrogen gas.

Carey Dale Grayson is set to die by nitrogen hypoxia after being convicted of killing 37-year-old hitchhiker Vickie Deblieux in 1994.

Grayson was one of four teenagers convicted of capital murder in the torture, bludgeoning and mutilation of Vickie Lynn Deblieux on Feb. 21, 1994.

Grayson was convicted with three other men for the brutal slaying and mutilation of 37-year-old Vicki Lynn Deblieux.

Grayson’s three accomplices managed to escape execution because they were under 18 at the time of Deblieux’s murder

A death row murderer has made one final defiant act, hurling seven dark last words and pulling the fingers before being executed via a new method that has been slammed at torturous. Carey Dale Grayson was convicted for the heinous 1994 murder of 37-year-old The 50-year-old murderer was one of four teenagers convicted of Deblieux’s killing as she hitchhiked through the state on the way to her mother’s home in Louisiana.

An Alabama prisoner convicted of the 1994 murder of a female hitchhiker became the third person executed by nitrogen gas in both the U.S. and Alabama.

On Thursday, the State of Alabama will carry out the nation's third nitrogen gas execution when 50-year-old Carey Dale Grayson is put to death for the murder of a woman in Jefferson County in the 90s.

An Alabama inmate convicted in a 1994 murder died Thursday in the state's third nitrogen hypoxia execution this year.

Alabama executed Carey Dale Grayson via nitrogen hypoxia for the 1994 murder of Vickie Deblieux, sparking renewed debate over capital punishment.