This is in the very early stages of the "news cycle" and has yet to be confirmed by the band/their management, but it seems that a lot of people close to the band are confirming this news:

http://www.blabbermouth.net/news/gwar-frontman-dave-brockie-a-k-a-oderus-urungus-reportedly-dead-at-50/

Not necessarily sure how many people here are into Gwar, but I felt the need to share it with everyone. I'm hoping I wake up to find that this was a big ol' hoax, but it's not looking good.