Arquette had recently finished filming Showtime's Escape at Dannemora, which she won the Golden Globe, Critics' Choice Award, and SAG Award for. That role already required some physical transformation like weight gain, and this role required even more.
"I started losing weight after Dannemora then I stopped for this, but this real lady was like a hundred pounds more and I thought, I will die, I'll just be a dead person, so I'm gonna stop here," Arquette said. "Now I'm going to start taking a little more care of my own self. But to work with these actresses—this is such exciting material and it's also about this relationship, this intense love affair that this mother's so jealous and protective of. The normal material thing's distorted beyond, and then they have this very important relationship..."
Take a look at King and Arquette in character, as well as some other famous True Crime transformations below!