Instagram/Neil Sedaka Music Neil Sedaka's cause of death revealed as atherosclerotic cardiovascular disease (ASCVD) at age 86. Details from the official death certificate. March 19, 2026 AceShowbiz - The official cause of death for Neil Sedaka, a prominent figure in 1960s and 1970s music, has been revealed. According to a death certificate obtained by the New York Post, Neil Sedaka passed away due to atherosclerotic cardiovascular disease (ASCVD). Kidney failure was also noted as a contributing factor.