The Sellers had lived in Pell City, Alabama for as long as they could remember. They had been married for over 17 years, established themselves in their local church, and had their first and only child, Sydney, in the city. Sydney was their pride and joy—in 2014, she was off to a successful first year of high school, earning her black belt in Taekwondo and taking honors classes. On December 7, she was “laughing, joking and watching TV;" everything seemed normal until her parents found her...