In October reporter Hilary Andersson was selected to witness an execution by lethal injection in Oklahoma. Her assignment led her to the case of Tremane Wood, who had spent more than two decades on death row. This is the story of what happens to a man as he waits to die.

This is the first of two episodes. Part two will be available on Tuesday 16 December. To listen to part two you can subscribe to The Observer via the link in the episode description or subscribe to Observer+ on Apple Podcasts. Part two will be available for free wherever you get your podcasts on Thursday 18 December.

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