Leila Williams is a former submissive of Christian Grey. Their relationship occurred approximately two and half years before the events of Fifty Shades of Grey. She left Christian when she met her husband. Four months prior to the series it is known that she left her husband for a lover, Geoff, who was killed in a car crash. After her lover's death, she had a mental breakdown.
Leila -- like all of Christian's former submissives -- is a pale, slender brunette. Her eyes are "brown, like bourbon". Ana is struck by how much she and Leila look alike.
While Christian is in Georgia with Ana, Leila breaks into Escala and cuts her wrist in front of Mrs. Jones. She was rushed to the hospital immediately, but checked herself out before Christian could fly back in time to help.
Leila stalks Ana while she is at work. When Christian finds out that Leila has obtained a gun, he insists that Ana stays with him at Escala, but Leila is able to break in and watch Ana sleep. Several days later, she breaks into Ana's apartment and threatens Ana with the gun. Christian is able to get Leila to lower her weapon, and calls Dr. Flynn to take her to a psychiatric hospital.
Christian tells Ana that Leila is doing much better, and is attending art school on the east coast. Ana is surprised, then, when Leila shows up at SIP, wanting to talk to her. She apologizes to Ana for the incident in the apartment, and confesses that she loved Christian at one time. However, her primary reason for visiting Ana at work was to trick Christian into rushing to Ana's side, so that Leila could talk to him in person. Leila knew that he would rush to protect Ana when he heard that Leila was back in town. Her ruse works, but Christian is furious: he threatens to pull his financial support for her schooling and medical care if she ever tries to contact him or Ana again.