At a concert in 2017, the audience quickly realized something was wrong with former teen idol David Cassidy—but they didn’t yet realize just how disturbing the truth was. | Factinate

70s teen idol David Cassidy had it all, but he had a darkness that few knew until his tragic death in 2017. Danny Bonaduce, his friend and TV brother, recalls his public admission of addiction. It's all in the new episode of "How it Really Happened with Hill Harper" airing Sunday at 9 p.m. PST / EST. | HLN

💖 Eight Years Later: Remembering David Cassidy 💖 It's hard to believe it's been eight years since we said goodbye to our beloved David Cassidy on November 21, 2017. 😔 To mark this difficult anniversary, we've put together a special video tribute. It's a small way for us all to reflect on the joy he brought into our lives and to remember the incredible talent and spirit we lost too soon. He remains so very much loved and deeply missed by every single one of us in this group and by fans around