[@Shadow Daedalus] Maybe instead of War and Murder, you could think of other things associated with Death? For example, the Greeks had two gods of war - Athena, who represented the thoughtful and strategic side of war, and Ares, who represented the raw rage/passion of warfare. They also had two deities of death (whose names escape me) one had the cruel, painful side of death and the other presided over the peaceful side of death/relief of suffering. Maybe you can do something like that. 

It's worth noting that in most classical theologies, gods had overlapping domains, so it's not really imperative that there be one and only god for a concept - especially because that concept is likely more complex than is normally represented in a deity, who are normally quite clearly driven (for example, having 2 greek gods of war because war has two distinct and fairly opposite aspects).

(If you're interested in overlapping deities, there are also Hera and Aphrodito, who both have the domain of love - Hera presides over monogamy and marriage and whatnot whereas Aphrodite presides over lust and passion)

Did I mention I'm taking university Classics? I'm a bit of a nerd about this stuff XD