From the Cramps’ Web site (additional links mine):

Contrary to some initial communication confusion in the rush for a press release in the midst of shock and chaos, Lux’s passing (from aortic dissection) was sudden, shocking, unexpected and totally devestating. Five days of heroic measures were unable to save him. The memorial service that is being planned for Lux will be deeply private and at an undisclosed location. We request that instead of flowers, a donation may be made in Lux’s honor to his favorite charity, Best Friends Animal Society.”