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Los Motivos de Luz is a 1985 Mexican drama film, directed by Felipe Cazals. The film stars Patricia Reyes Spíndola, as Luz, a woman accused of murdering her four children, after being accused by her husband and her mother-in-law. Los Motivos de Luz was written by Xavier Robles based on the real case of Elvia Luz Cruz. The film received two Ariel Awards in 1986, for Best Actress (Spindola) and Best Supporting Actress (Murguía).