KISS frontman Gene Simmons has made shocking claims about bandmate Ace Frehley’s death, alleging “bad decisions” led to his passing.

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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, suggesting it was to blame for the guitarist’s fatal fall down the stairs in his Morristown, New Jersey, 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 New York Post on Sunday.

“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.

Simmons also opened up about the guitarist’s private funeral service on October 22.

“It breaks my heart. Peter Criss, our founding drummer, Paul [Stanley] and myself went to the funeral, open casket,” he said, calling it “heartbreaking” and “sad.”

“Saddest of all perhaps is that Ace just couldn’t stay alive long enough to sit there proudly at the Kennedy Center and listen to – I can’t even tell you who’s going to come out … really impressive people, just to say how much KISS meant to them. What can you say – sad.”

The surviving KISS members — Simmons, Criss and Stanley — had a brief reunion as they went to Washington, DC, on Saturday to collect a Kennedy Center Honour.