Oct. 23 (UPI) -- Alabama on Thursday executed a death row inmate using a method Supreme Court Justice Sonia Sotomayor called "torturous suffocation" for a 1993 murder that he maintains he did not commit.

Anthony Boyd, 53, was killed by nitrogen hypoxia at the William C. Holman Correction Facility in Atmore, Ala., the state's department of corrections told UPI in a statement.

Alabama Gov. Kay Ivey had issued a 30-hour time frame for Boyd's death sentence to be carried out, from 12 a.m. CDT Thursday, with it starting on time at 6 p.m.

Boyd was pronounced dead at 6:33 p.m., the Alabama Department of Corrections told UPI.

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