Abe Bonowitz of Death Penalty Action leads a outside the...

Abe Bonowitz of Death Penalty Action leads a outside the Capitol in Montgomery, Ala., on Monday, Nov. 18, 2024, against a scheduled execution in Alabama using nitrogen gas. Credit: AP/Kim Chandler

ATMORE, Ala. — An Alabama inmate convicted of the 1994 murder of a female hitchhiker was scheduled to become the third person in the nation executed using nitrogen gas on Thursday evening.

Carey Dale Grayson, now 50, was one of four teens convicted of killing Vickie Deblieux, 37, who was hitchhiking through Alabama on her way to her mother’s home in Louisiana. Grayson's execution was set to be carried out after 6 p.m. local time at the William C. Holman Correctional Facility in south Alabama.

Alabama this year began using nitrogen gas to carry out some death sentences, the first use of a new execution method in the U.S. since lethal injection was introduced in 1982. 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 U.S. Supreme Court on Thursday morning turned down Grayson's request for a stay. No other appeals were pending.

Alabama maintains the method is constitutional. But critics — citing how the first two people executed shook for several minutes — say the method needs more scrutiny, particularly if other states follow Alabama’s path.

“The normalization of gas suffocation as an execution method is deeply troubling,” said Abraham Bonowitz, executive director of Death Penalty Action, a group seeking to stop executions and abolish the death penalty.

Deblieux’s mutilated body was found at the bottom of a bluff near Odenville, Alabama, on Feb. 26, 1994. Prosecutors said Deblieux was hitchhiking from Chattanooga, Tennessee, to her mother’s home in West Monroe, Louisiana, when 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 demonstrator holds a sign during a protest outside the...

A demonstrator holds a sign during a protest outside the Capitol in Montgomery, Ala., on Monday, Nov. 18, 2024, against a scheduled execution in Alabama using nitrogen gas. Credit: AP/Kim Chandler

A medical examiner testified that Deblieux’s face was so fractured that she was identified by an earlier X-ray of her spine. Her fingers had also been severed. Investigators said the four teens were identified as suspects after one of them showed a friend a severed finger and boasted about the killing.

Grayson is the only one of the four facing a death sentence since the others were under 18 at the time of the killing. Grayson was 19. Two of the teens were initially sentenced to death but those sentences were set aside when the U.S. Supreme Court banned the execution of offenders who were younger than 18 at the time of their crimes. Another teen involved in Deblieux’s killing was sentenced to life in prison.

In the hours ahead of his execution, Grayson visited with his attorneys. He also requested a seafood platter and tacos and burritos for a meal, food brought in from restaurants near the prison.

Grayson’s final appeals focused on the call for more scrutiny of the new execution method. They argued that the person experiences “conscious suffocation” and that the first two nitrogen executions did not result in swift unconsciousness and death as the state promised.

This undated photo provided by the Alabama Department of Corrections...

This undated photo provided by the Alabama Department of Corrections shows Carey Dale Grayson, one of the state's death row inmates who asked to have his execution carried out by nitrogen gas. Credit: AP

“Given this is the first new execution method used in the United States since lethal injection was first used in 1982, it is appropriate for this Court to reach the issues surrounding this novel method,” Grayson’s attorneys wrote. His attorneys on Thursday morning filed a separate emergency motion with a federal judge asking that he be allowed to take a sedative before the execution to help with his fear. However, they later withdrew the motion.

Lawyers for the Alabama attorney general’s office asked justices to let the execution go forward, saying a lower court found Grayson’s claims speculative.

The state lawyers wrote that Alabama’s “nitrogen hypoxia protocol has been successfully used twice, and both times it resulted in a death within a matter of minutes.”

Get the latest news and more great videos at NewsdayTV Credit: Newsday

Cost of Grumman's Bethpage cleanup ... What's up on LI ... Get the latest news and more great videos at NewsdayTV