Megadeth went back to playing live in June 1997. They started a world tour with the Misfits. They also played in North America with Life of Agony and Coal Chamber. In 1998, the band played at Ozzfest. Menza found a tumor on his knee in the middle of the tour. He left to get surgery for it. Jimmy DeGrasso replaced him for the rest of the tour. DeGrasso joined the band after the tour. The band made Menza leave. Mustaine later said he thought Menza was lying about having cancer.