Sullivan, better known by his stage name "The Rev," was 28 years old. The Orange County Coroner's Office is investigating his death but for the time being they're calling it natural causes. However, the drummer had a reported history of hard drug use.

The band released the following statement on their official site: It is with great sadness and heavy hearts that we tell you of the passing today of Jimmy "The Rev" Sullivan. Jimmy was not only one of the world's best drummers, but more importantly he was our best friend and brother. Our thoughts and prayers go out to Jimmy's family and we hope that you will respect their privacy during this difficult time. - read the full Antiquiet report here