Instagram/Dave Mustaine Music Megadeth's Dave Mustaine reveals his raw, decade-long battle with cancer in his new memoir, "In My Darkest Hour." A story of survival and confronting mortality. March 20, 2026 AceShowbiz - Dave Mustaine, the founder and frontman of the legendary thrash metal band Megadeth, is preparing to share the most harrowing chapter of his life in a forthcoming autobiography. The book, titled In My Darkest Hour: A Memoir, is scheduled for release on September 8 and will offer a raw, in-depth look at his battle with cancer over the past decade.