"The members of Twisted Sister are profoundly saddened to announce the untimely passing of our brother, AJ Pero," the post reads. "The band, crew and most importantly the family of AJ Pero thank you for your thoughts and prayers at this time."
Pero died of an apparent heart attack, according to the AP. While touring with Adrenaline Mob, a group he played with between Twisted Sister gigs, Pero was found unresponsive by his bandmates on their tour bus on Friday (March 20) morning. He was pronounced dead at a hospital in Poughkeepsie, New York, shortly after 11a.m. ET.