Rock legends Gene Simmons and Paul Stanley are mourning the loss of KISS co-founder Ace Frehley, who passed away Thursday at 74.

“We are devastated by the passing of Ace Frehley,” Simmons, 76, and Stanley, 73, said in a joint statement to Variety on Thursday. “He was an essential and irreplaceable rock soldier during some of the most formative foundational chapters of the band and its history.”

“He is and will always be a part of KISS’s legacy,” they added. They also sent condolences to Frehley’s estranged wife Jeanette Trerotola, his daughter Monique Frehley, and “all those who loved him, including our fans around the world.”

Paul Stanley and Peter Criss Mourn Ace Frehley on Social Media

Later that Thursday, Stanley honored the late guitarist with a candid throwback picture of them to

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