The 55-year-old drummer was reportedly found unresponsive during a tour with the band Adrenaline Mob, reported Ace Showbiz.
The band confirmed the sad news with a statement posted on Facebook, "The members of Twisted Sister are profoundly saddened to announce the untimely passing of our brother, AJ Pero. The band, crew and most importantly the family of AJ Pero thank you for your thoughts and prayers at this time."
Twisted Sister's lead vocalist Dee Snider dubbed Pero "the final piece in a band that would become an international sensation and one of the greatest live rock acts to ever hit the stage."
Another Twisted Sister member, Eddie "Fingers" Ojeda, said in a statement, "AJ was a dear friend and brother to me, and in my opinion, one of the most talented drummers of all time.
"I will always remember the amazing experiences and great laughs we shared. AJ always had an amazing sense of humour and did his best to please everyone he came in contact with.
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