In the now no longer aviable visits to his sisters court, there was a cutscene where it shows a ghost reviving him.
Wait - this is no longer available? It's one of things I keep meaning to look into how I can chase down that story thread now that I'm back to playing Destiny 2. I checked out during Forsaken just before this whole story line started.
I figured I was just missing something, as The Dreaming City as a quest hub seems like a mess right now