Kenneth Smith, a convicted murderer, has become the first person to be executed by asphyxiation with nitrogen gas in the United States.Officials said 58-year-old Smith was pronounced dead at 8:25pm on Thursday (02:25 GMT on Friday) at Holman Correctional Facility in Alabama after breathing pure nitrogen gas through a face mask to cause oxygen deprivation.His death marks the first time that a new execution method has been used in the United States since lethal injection, now the most commonly used method, was introduced in 1982.
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