Margaret Ratliff was 20 when she agreed to appear in the 2004 documentary series “The Staircase,” which famously chronicled the case of her adoptive father, Michael Peterson, who was found guilty of killing his wife, Kathleen.
The groundbreaking true-crime series was updated over the years, with Netflix adding all 13 episodes to its catalog in 2018. By then, Peterson had pleaded guilty to a reduced charge of manslaughter, was sentenced to time served and was freed.
