48 Hours

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.

A Pennsylvania man claims a freak accident while handling his gun caused the death of his wife, Melissa Rocuba. Bruno Rocuba was not arrested or charged with any crime. Years later, investigators uncover disturbing new evidence that challenges Bruno Rocuba's story, including surveillance audio capturing his wife's final moments. The recording raises haunting questions about what really happened in that bedroom and whether Melissa Rocuba's death was truly an accident. 48 HOURS correspondent Anne-Marie Green reports on the case in "Melissa Rocuba's Final Moments."

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. 

The investigation into Katlyn's death, which was initially reported as a medical emergency after her 4-year-old daughter found her unresponsive. Evidence soon revealed she had been strangled with phone charging cables in what prosecutors called a "cold-blooded and calculated" attack following a recent breakup.