 In 2005, the producers decided to kill off Cassie by having her die from injuries sustained in a car accident.The character's death was felt in storyline for years to follow, leading to the dissolution of her parents' marriage and numerous events thereafter.Grimes continued to recur in the role throughout the years following her character's death, usually in dreams or as a hallucination to the mentally ill. Grimes' final return as Cassie's ghost was over the course of July 8, 2013 to October 30, 2014, during which the actress would return to "The Young and the Restless" as a main cast member, as Cassie's previously unknown twin sister, Mariah Copeland.