For years, the star believed she had inherited a mental illness; that her bloodline was cursed and she would end up in an institution. As the world prepares to mark 100 years since her birth, her biographer Andrew Wilson looks at her lifelong struggle and what unpublished letters from Marilyn’s last psychoanalyst really reveal N ext month, it will be 100 years since the birth of Marilyn Monroe , an occasion marked by a major exhibition at the National Portrait Gallery , a season of films at the