When a gravely ill young woman is rushed to the hospital, doctors make a shocking discovery: she has an "astronomical" amount of lead in her body. What begins as a medical mystery quickly becomes a criminal investigation. Hannah Pettey, a young mother from Alabama, suffered debilitating pain and lost more than 45 pounds in the months prior as her health rapidly declined. Investigators focus on the two people she trusted the most as the police work to uncover who was poisoning Hannah, and why. 48 HOURS correspondent Anne-Marie Green reports on the case in "The Gaslighting of Hannah Pettey," which includes Green's multiple interviews with survivor Hannah Pettey and an exclusive interview with the prime suspect in the case, Hannah's husband, Brian Mann.

When Debe Atrops was murdered, her daughter, Rhianna Stephens, was just 8 months old. More than 30 years later, a cold case team from Washington County took a fresh look at the case by talking to witnesses and running new tests on old evidence. The team thought they had enough to prosecute Debe's estranged husband at the time of her murder, Bob Atrops, who is also Stephens' father. Stephens is convinced they have the wrong man – after losing her mother, she fears losing her father too.