Murther is a lovely old word, with echoes of bother, smother, and of course mother. A murther of crows is much more evocative than a murder of crows. Murder also feels like the act complete, whilst with murther it is still happening.

Further, and I think I am correct in this, the word, murther/murder, was initially used for the killing of a Norman by a non-Norman, of a lord by his servant, so your words for the wolf bring images for me of the forest outlaw, Robin Hood, but violent and not romantic.