A.J. Pero, longtime drummer for the metal band Twisted Sister, died Friday at age 55.

His longtime agent, Dan Stanton, told CNN he thinks Pero died of what appears to be a massive heart attack.

An official cause of death has not been released.

Twisted Sister posted the news to Facebook.

Later on Friday, the band posted a personal message from each member.

Twisted Sister guitarist Jay Jay French notes that This April 1st would have been Pero's 32nd year as a member.
Pero joined the band in 1982, though he left for a time in 1987 to join another band, he reunited with Twisted Sister in the 1990s and was with them for the past 12 years.

In recent years, he was also the drummer for the band Adrenaline Mob, who also posted about Pero's passing on Facebook.

Twisted Sister is probably best known for its 1984 song “We’re Not Gonna Take It”. In the music video, which also starred “Animal House’s” Mark Metcalf, Pero can be seen in concert, hitting a drum that brings up a cloud of glitter.
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