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Allie was Holden's younger brother. He had red hair and was known as the smartest of the family. At a young age he died of Leukemia. This event took away part of Holden's innocence. Holden is scarred from his death and carries around Allie's old baseball mitt, which comforts him. Ultimately, it is Allie's death that causes Holden to lash out and mentally break down.