Alan Eugene Miller is seen in an undated photo. An inmate in Alabama is coming to face to face with death for a second time in two years as he’s set to become the second person known to be executed by nitrogen hypoxia, a controversial method critics say is tantamount to torture.
Mandatory Credit:	Alabama Department of Corrections via CNN

Alan Eugene Miller is seen in an undated photo. An inmate in Alabama is coming to face to face with death for a second time in two years as he’s set to become the second person known to be executed by nitrogen hypoxia, a controversial method critics say is tantamount to torture.
Mandatory Credit: Alabama Department of Corrections via CNN

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Alabama is set to execute its second inmate by nitrogen gas, a relatively new method of capital punishment

An inmate in Alabama is coming face to face with death for a second time in two years as he’s set to become the second person known to be executed by nitrogen hypoxia, a controversial method critics say is tantamount to torture.