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Alexis "Lex" Murphy is John Hammond's granddaughter and Tim's sister, who accompanied the endorsement team on the tour as a gift due to her parents getting a divorce. Her novel and film version are very different, with a number of her traits being given to her brother and vice-versa. Being John Hammond's granddaughter, she is second-generation Scottish-American.

Lex will return in Jurassic World 3.