The Good Morning Britain presenter travels to Texas, home of the most active death chamber in the United States, to meet death row inmate Darlie Routier. Twenty three years ago, the Dallas housewife was convicted and sentenced to death by legal injection for killing one of her sons, and remains accused of murdering the other - despite there being no eyewitnesses, no confession and no motive. Darlie denies the murders and decades on has refused a route off death row in exchange for accepting her guilt. Susanna delves into the history of the case, meeting key witnesses and family members, to find out if the convict is as innocent as she claims