The Black Dahlia Murder has lost guitarist John Kempainen, who has abruptly left the band.

The band apologized for the news and explains that Kempainen "refused" to accompany them on the tour:

"We are left with no choice but to carry on with the dates as a four piece. The remaining members of the band apologize for these unprofessional circumstances, but we feel that it is best to go through with the tour and not disappoint the other bands as well as the fans who are looking forward to these shows."

That tour they speak of is with Soilent Green and Misery Index and kicks off tomorrow in Iowa City.

They released Nocturnal last year on Metal Blade.