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6 people killed in nitrogen leak at Georgia poultry plant

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Alabama death row inmate who was executed with nitrogen gas for the 1999 murders of Lee Holdbrooks

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Alabama executes a man with nitrogen gas, the first time the new method has been used

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“Violently shaking, thrashing:” Witness details first ever nitrogen gas execution

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Witness describes final moments of Alabama prisoner Kenneth Smith killed with nitrogen gas

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Detroit man put to death for a 1991 murder in the nation's fourth execution using nitrogen gas

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Alabama set to execute a man with nitrogen gas for 1991 murder and rape

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State to execute second inmate using nitrogen hypoxia

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Alabama performs first execution in US using nitrogen gas

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What is nitrogen hypoxia? Examining the untested execution method

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Carey Dale Grayson executed by nitrogen hypoxia

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