By Gina VivinettoOriginal Source: today.comPhilip Seymour Hoffman's partner, Mimi O' Donnell, is opening up about the late "Hunger Games" star's tragic drug overdose nearly four years ago at the age of 46.In a candid essay for Vogue magazine, O'Donnell shared details about her life with the Oscar winner and their three children — Cooper, 14, Tallulah, 11, and Willa, 9 — and reveals what happened in the dark days after Hoffman suddenly relapsed after two decades of sobriety."From the beginning, Phil was very frank about his addictions. He told me about his period of heavy drinking and experimenting with heroin in his early 20s, and his first rehab at 22," wrote O'Donnell, who began dating Hoffman in 2001."Being sober and a recovering addict was, along with acting and directing, very much the focus of his life," she added. "But he was aware that just because he was clean didn’t mean the addiction had gone away. He was being honest for me — This is who I am — but also to protect himself."He told me that, as much as he loved me, if I used drugs...click here to continue reading