The rocker's death was confirmed by his brother, Bruce Kulick, on social media on Friday.

"Please respect the Kulick Family’s privacy during this sad time.  RIP" No cause of death is known at this time.

Our deepest condolences to the Kulick family in this difficult time.".

Our deepest condolences to the Kulick family in this difficult time.

He also worked on Kiss singer Paul Stanley's 1978 solo album.

and more friends expressed their condolences on social media.

My condolences to his brother Bruce and extended Kulick family.https://t.co/8Snr5tRwUG.

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