What kind of love is worth killing for? The all-consuming love, the obsessive love, unrequited love, friendship, familial bonds? Who knows, It all depends on those in the relationships and their motives. 

The best kind of love that can be described in the supernatural world is that of the mate bond. You usually mate with those of the same species, but now and then there is something other or at least thought to be other. It's not typical for wolves to interact with humans as much as some other species.