A.J. Pero, probably best known as the drummer for Twisted Sister, passed away this morning at age 55. 

The band released the following statement on their Facebook page: "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."

Pero also played for Adrenaline Mob, as well as some shows with Four By Fate and The Foundry.

Here's a video of him performing at Bonzo Bash 2014. RIP, A.J. Our thoughts are with his loved ones.