1. "Pathological" (Season 19)
The real crime: This is an INSANE example of how things are not always as they appear. Gypsy Rose Blanchard was a victim of Munchausen by proxy, in which her mother, Dee Dee Blanchard, pretended her daughter was disabled and chronically ill. At the hands of her abusive mother, Gypsy had to use feeding tubes, was kept wheelchair bound and spent her entire childhood in hospitals to treat conditions and illnesses she didn't actually have. This all culminated in 2015 when the 23-year-old Gypsy Rose brutally murdered her mother at their home in Missouri.