1. ‘A monster': Demetrius Frazier executed by nitrogen gas in Alabama for woman’s 1991 murder  USA TODAY
2. Alabama executes Demetrius Frazier by nitrogen gas for 1991 murder  Montgomery Advertiser
3. Alabama executes a man with nitrogen gas for 1991 murder and rape  NBC News
4. US: Alabama carries out fourth nitrogen gas execution for 1991 killing  The Times of India
5. Demetrius Frazier set to be executed with controversial nitrogen gas method. What to know.  USA TODAY

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