Alabama prepares to put inmate to death in second U.S. nitrogen gas execution  NBC NewsAlabama is set to execute its second inmate by nitrogen gas, a relatively new method of capital punishment  CNNAlabama Set to Carry Out Second Execution Using Nitrogen Gas  The New York TimesAlabama set to carry out second nitrogen gas execution  The Guardian USAlan Eugene Miller to become 2nd inmate executed with nitrogen gas in US. What to know  USA TODAY