Sadly, this isn't terribly surprising news. Weiland famously struggled with addiction. He was only 48 years old.
A message posted on Weiland's Facebook page reads, "Scott Weiland, best known as the lead singer for Stone Temple Pilots and Velvet Revolver, passed away in his sleep while on a tour stop in Bloomington, Minnesota, with his band The Wildabouts. At this time we ask that the privacy of Scott's family be respected."