The late-night order by the Supreme Court in Washington was the seventh time that Thomas Arthur, 74, has seen his scheduled execution called off.
Arthur had been scheduled to die at 6 PM at the prison in Altmore, following decades-long imprisonment for his conviction in the 1982 murder of his mistress's husband.
Supreme Court Justice Clarence Thomas issued an order about 10:30 PM yesterday temporarily halting the execution, which had been delayed so he could consider the issue, until he or other justices made another decision, a court document said.
If it decides not to take on the case, the stay would be terminated, the Washington Post said.
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Lawyers for Arthur had argued that a drug in Alabama's lethal injection cocktail, the sedative midazolam, would have "torturous effects," after having been used in three botched executions elsewhere, the newspaper said.
The lawyers had also filed an appeal based on Arthur's being sentenced to death by a judge following a non-unanimous jury recommendation.
The pace of executions is declining in the United States, due to a combination of factors including a shortage of the drugs used to carry out lethal injections.
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