ATMORE, Ala. (AP) — A man convicted in the 1994 killing of a female hitchhiker in Alabama was put to death Thursday evening in the nation’s third execution using nitrogen gas. Carey Dale Grayson, 50, was pronounced dead at 6:33 p.

m. at William C. Holman Correctional Facility in southern Alabama following the use of the new death penalty method.

He was one of four teens convicted of killing Vickie Deblieux, 37, as she was hitchhiking through Alabama on the way to her mother’s home in Louisiana. Alabama began using nitrogen gas earlier this year to carry out some executions. The method involves placing a respirator gas mask over the person’s face to replace breathable air with pure nitrogen gas, causing death by lack of oxygen.

The execution was carried out hours after the U.S. Supreme Court turned down Grayson’s request for a stay.

His attorneys had argued that the method needed more scrutiny before being used again. Deblieux’s mutilated body was found at the bottom of a bluff near Odenville, Alabama, on Feb. 26, 1994.

She was hitchhiking from Chattanooga, Tennessee, to her mother’s home in West Monroe, Louisiana, when the four teens offered her a ride. Prosecutors said the teens took her to a wooded area and attacked and beat her. They threw her off a cliff and later returned to mutilate her body.

A medical examiner testified that Deblieux’s face was so fractured that she was identified by an earlier X-ray of her spine. Investigators said the teens were identi.