Sidney Poitier Cause of Death Revealed WHUR Contributor January 19, 2022 at 11:30 am in ENTERTAINMENT Tweet The cause of death behind legendary actor Sidney Poitier has been revealed. According to his death certificate, Poitier died of heart failure, dementia, and prostate cancer. Poitier was the first Black man to win an Oscar for Best Actor and paved the way for many actors after him to this day. The beloved actor died at his home in Beverly Hills. He was 94-years-old and according to his death certificate, was an actor for a whopping 76 years. Tags: Sidney Poitier, Sidney Poitier Cause of Death Revealed, Sidney Poitier Dead