When Andrea Knabel went missing in 2019 at the age of 37, her work as an advocate for missing persons became a focal point, as did her history with drug abuse. The media ran with this narrative. But investigators claim that circumstantial evidence, Andrea’s last-known location and a history of violence indicate that Andrea’s sister Sarah Knabel and her boyfriend Ethan Bates may know more about the woman’s disappearance than they’ve let on.