AJ Pero’s Twisted Sister band mate Dee Snider revealed the he died of a massive heart attack. Snider stated what happened after answering a Tweet from a curious fan.

According to Loudwire.com, Snider mentioned that AJ Pero had advanced heart disease. AJ Pero died on March 20 at the age of 55. He was on tour with his band, Adrenaline Mob when he passed. Following the news of his death there has been an out pouring of emotions while friends, family, and fans are having a difficult time coping with the news. Embedded below is one Tweet from Snider that displays his disbelief over the news.

http://loudwire.com/twisted-sister-dee-snider-a-j-pero-cause-of-death/ also noted that many of the band’s fans have taken to Twitter to pay their respects to AJ Pero and his family. Additionally the day after his death, Ultimateclaicrock.com reported that Jay Jay French of Twisted Sister and Dream Theatre drummer Mike Portnoy joined Adrenaline Mob for a tribute performance of “You Can’t Stop Rock ‘n’ Roll.”

Also, according to Ultimateclassicrock.com, Snider was asked how they’d replace Pero. “You don’t.” Snider responded, “We’ll continue to play, probably, for his family, because his family will benefit financially from us playing. But it was all five original members of Twisted Sister, and he was the first one we lost. The band is heartbroken. … He was a very underrated drummer, an amazing drummer. AJ Pero — always remember him.”

I have to say, the passing of AJ PERO just doesn't seem real. It will be at his wake in NY on Wednesday. #EndOfAnEra

— Dee Snider (@deesnider) March 22, 2015