Nitschke told The Associated Press that Smith’s facial hair, jaw movements and involuntary movements as he feels the effect of the nitrogen could impact the seal. If there are leaks, Smith could continue to draw in enough oxygen, “to prolong into what could be a very rather macabre, slow process of slowly not getting enough oxygen,” Nitschke said. He said he could envision scenarios where the execution goes quickly or seriously awry.

Smith’s attorneys have raised concerns that Smith could choke to death on his own vomit as the nitrogen gas flows. The state made a last-minute change to procedures to say he will not be allowed food in the eight hours leading up to the execution.

Sennett, 45, was found dead March 18, 1988, in her home in Colbert County with eight stab wounds in the chest and one on each side of her neck, according to the coroner. Her husband, Charles Sennett Sr., killed himself when the investigation focused on him as a suspect, according to court documents. John Forrest Parker, the other man convicted in the slaying, was executed in 2010.

Smith’s 1989 conviction was overturned. He was convicted again in 1996. The jury recommended a life sentence by 11-1, but a judge overrode the recommendation and sentenced Smith to death. Alabama no longer allows a judge to override a jury’s death penalty decision.

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