(CNN) - The longtime partner of actor Philip Seymour Hoffman talks openly about his drug addiction. In an essay published in Vogue on Wednesday, Mimi O'Donnell speaks of the Oscar-winner's relapse which led to his death in 2014.
O'Donnell says she identifies one moment as a red flag when Hoffman asked her what she thought of him starting to drink again. She says he started having a drink or two, then admitted to her he was also taking prescription opioids.
O'Donnell says during and after shooting The Hunger Games, Hoffman began struggling and started using heroin again. She says shortly after that he was dead.
O'Donnell says she "had been expecting him to die since the day he started using again."
She says her children, ages 14, 11 and 9, pulled her through the grief. Hoffman died from a heroin overdose at the age of 46.
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