It’s a sad day for the rock community, as news breaks on the death of Scott Weiland, pioneering alternative rock vocalist for Stone Temple Pilots and Velvet Revolver.

Weiland, who recently turned 48, was found dead on his tour bus yesterday evening  in Bloomington, Minnesota before a scheduled performance with his band the Wildabouts.

Weiland passed away in his sleep, and the immediate cause of death is now being reported as cardiac arrest, but many are speculating that the underlying cause was related to the singer’s persistent struggle with drugs. “Sad to hear about Scott’s passing. I hope it wasn’t drugs.” Nikki Sixx tweeted. MTV and VH1music personality Matt Pinfield tweeted, “Addiction sucks.”

Weiland was well known as a charismatic, fashionable and wild frontman, who rose to prominence in the ‘90s with his band Stone Temple Pilots. The Grammy winning band  was ranked among VH1’s 100 Greatest Artists of Hard Rock, charting 16 top ten rock singles on Billboard and selling nearly 40 million records worldwide. In 2002, Weiland joined supergroup Velvet Revolver with Guns N’ Roses members Slash, Duff McKagan and Matt Sorum.

Music industry A-listers have taken to social media to share their sadness over Weiland’s passing, as well as memories of the talented, game-changing musician who won’t soon be forgotten.