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(TMZ) - Dave Brockie -- lead singer of the crazy costumed "Beavis & Butthead" worshipped speed metal band Gwar -- is dead at age 50, reports TMZ.

Law enforcement sources tell TMZ ... Brockie -- a.k.a. Oderus Urungus -- was found early Sunday morning dead, sitting upright in a chair at his Richmond, VA home.

TMZ reports foul play is not suspected ... and one law enforcement source told them, "There were no drugs found, as far as I know."

Another law enforcement source tells TMZ it was not a suicide.  No note was found. Brockie was found by his roommate.

The band shot to superstardom because their over-the-top horror show music videos were a staple on "Beavis and Butthead" back in the day.

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