"A Study in Scarlet," John Ferrier is murdered because he refuses to let his daughter, Lucy, be married off to one of the Mormon elders. This puts him at odds with the Mormon leadership, leading to his death. Lucy's tragic fate is tied to her father's murder; she's essentially forced into a marriage she doesn't want and dies shortly after, presumably of heartbreak and despair. 

There is some ambiguity surrounding Lucy's death. While the text suggests she died of despair, some interpretations, speculate she might have been poisoned by Enoch Drebber. Either way, her tragic end is a direct result of the actions and decisions made by the Mormon leadership and her forced marriage to Drebber. It adds another layer of complexity to the story, doesn't it?
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