The state of Alabama executed Anthony Todd Boyd on Thursday night for the 1993 murder of Gregory Huguley, carrying out the state’s seventh nitrogen gas execution despite Boyd’s longstanding claims of innocence and legal challenges arguing that the method is unconstitutional.

Boyd was pronounced dead at 6:33 p.m. at William C. Holman Correctional Facility in Atmore, where Alabama’s death row and only execution chamber are housed. The execution marked the fifth carried out in the state this year and the second in which an inmate publicly maintained innocence until the end.

Governor Kay Ivey confirmed the execution just after 6:30 p.m., stating she had denied Boyd’s request for clemency earlier in the day.

“On the evening of July 31, 1993, Anthony Boyd and three other men kidnapped Gregory

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