Slayer, King Diamond rumored for 2015 Mayhem Fest

Citing what they consider to be "credible rumors," ThePRP has revealed a handful of bands slated to appear on the 2015 Rockstar Energy Drink Mayhem Festival (an official lineup announcement will be made on April 13). Here are the bands ThePRP identified: Slayer King Diamond Hellyeah The Devil Wears Prada Whitechapel Thy Art Is Murder