A.J. Pero died of apparent heart attack on tour bus with Adrenaline Mob a group with which he played in between engagements with Twisted Sister.
This is a statement from Twisted Sister 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.