Riley Gale's Cause of Death Unveiled to Be Fentanyl Overdose Celebrity The death of the Power Trip frontman, who died in August 2020 at the age of 34, has been ruled an accident as his autopsy report mentions his 'history of Xanax abuse' and 'history of depression.' May 27, 2021 Riley Gale died of a fentanyl overdose. The thrash metal singer passed away last year, aged 34. While no cause of death was given at the time, Power Trip collaborator Ice-T hinted in an interview with Stereogum in December that it was opioid-related. And now an autopsy report from Dallas County Medical Examiner's o...