AJ Pero, the drummer with US heavy metal band Twisted Sister, has died aged 55.
The group announced his death on their website, but did not give the cause of death.
Pero first joined Twisted Sister in 1982 and left in 1986, but he later reunited with the band in 2001 and continued to perform with them.
We write this with tears in our eyes & our hearts broken to pieces.. our beloved brother AJ Pero peacefully passed away in his sleep this morning on the bus. We are in complete shock & our hearts & prayers go out to his family. It has been nothing short of an honor to have shared the stage with such a beautiful soul & legend! We love you AJ, rest in peace.
We will cherish this last picture we all took together on tour forever! What a great night we had... we'll miss you buddy!