Article continues below advertisementGene Simmons is getting candid about his friend and fellow KISS bandmate Ace Frehley's death. Simmons, 76, told an outlet on Saturday, December 6, that he believes Frehley's "bad decisions" related to substance abuse led to his October death at age 74. Frehley died of blunt trauma injuries to the head after falling down the stairs of his Morristown, NJ, home.Article continues below advertisementGene Simmons Thinks Substance Abuse Issues Led to Ace Frehley's Death Source: mega'He refused [advice] from people that cared about him,' Gene Simmons said.