In the books, Leila is one of Christian Grey's (Jamie Dornan) former submissives that breaks into his apartment to commit suicide after realizing he doesn't want her anymore. Leila is supposed to be a warning of what could happen to someone in a long term relationship with Christian and his demands, but inevitably serves just to make Ana (Dakota Johnson) jealous of the attention Leila receives after she's pulled back from the proverbial edge.
Heathcote (Pride and Prejudice and Zombies) joins Kim Basinger as Elena Lincoln, Christian's former dominatrix, in the sequel. James Foley is taking over directing reins from Sam Taylor-Johnson after the first film, with Niall Leonard and Fifty Shades novel writer E.L. James writing the script.
Fifty Shades Darker is due out Feb. 10, 2017.
WATCH: Dakota Johnson is "proud" of Fifty Shades of Grey," slams Hollywood as a "brutal" industry