With further reading I have come to believe that Lorkhan is NOT dead in the way a mortal on Tamri'el will die...perhaps he is half dead?
Yes, half dead. What happens to a god is not the same as what happens to mortals. The Monomyth is clear:
After the world is materialized, Lorkhan is separated from his divine center, sometimes involuntarily, and wanders the creation of the et'Ada.
And then Shor of Shor:
And he took the third by vomiting his own heart into the circle like a hammerclap, guarding his wraith in the manner of his father and roaring at the other tribes
It is pretty clear that the separation from his divine center did not obliterate the entity....
What was left however is not as apparent to me.