KISS frontman Gene Simmons blamed “bad decisions” for his friend and fellow bandmate Ace Frehley’s death.

The band’s co-founder condemned Frehley’s substance abuse he suggested was to blame for the guitarist’s fatal fall down the stairs in his Morristown, NJ, home studio.

“He refused [advice] from people that cared about him – including yours truly – to try to change his lifestyle. In and out of bad decisions. Falling down the stairs — I’m not a doctor — doesn’t kill you. There may have been other issues, and it breaks my heart,” Simmons told The Post on Saturday.

“The saddest thing – you reap what you shall sow unfortunately,” the singer, 76, added, also referencing Frehley’s struggles with alcoholism. However, Frehley had been sober for 20 years before his death.

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