I did not read all the posts in this thread, but can add some info.
There was a TV documentary about the person killed (post 6) in the north east. The biologist and scientist in that area (n.e. US and Canada) have determined the coyotes indeed have crossed with wolves of that area to produce a "super coyote" that is an EXCEPTIONALLY dangerous animal.
Now, how far south and west they range from that area, no one knows for sure yet. I will suspect the migration of this cross species will be westerly north of the major Canadian population centers. West past the Great Lakes before moving south again.
This will be kind of opposite the migration route that Mountain Lions have traveled lately to get to the n.e. US.
Back in the olden days when I was a kid in northern Wyoming, coyotes were VERY territorial and did not bother live stock unless they learned to. So you let them alone to keep other coyotes away. BUT.... Once they learned to bother live stock.......... Open season.
Good luck