Article continues below advertisementAce Frehley's cause of death has finally been revealed, nearly one month after the KISS guitarist passed at 74. Frehley's official cause of death was a result of blunt trauma to the head and was ruled an accident, a news outlet reported on Monday, November 10. Article continues below advertisementAce Frehley's Cause of Death Was RevealedSource: MEGAAce Frehley's death was ruled as an accident.The musician died after being placed on life support following a fall in a studio that caused a fracture to the back of his skull and a stroke.