The furious heavy rocker took to social media on Thursday (22Oct15) to apologise to fans at the concert, insisting they deserve "way better" that "what this jerk-off did tonight".

Mustaine doesn't go into details, but claims the the former employee was a "total waste of skin and life".

He adds, "MEGADETH is much better than what we appeared tonight. But you know what the funny thing is? He (technician) has to live with himself. And as of, like, right now, I'll never see his stupid a** again."

It's still not clear what the roadie did to upset and annoy the frontman.