I think that depends on how you view "Death." A god(des?) "of Death" would be a deity who represents the cessation of life, and would therefore not only be about human death, but also the death of plants, flies, bacteria, fungi, and potentially celestial bodies. This is different from a god(des?) "of the Dead," which would be more about any afterlife, shepherding entities towards redemption/reincarnation/redistribution.
--Patrick
--Patrick