Ran through town as a werewolf with him and guards chasing me.
After doing the mission with Aela I found his dead body in town.
Later in the game the Skyforge guy was lying dead in the streets, have no clue why.
Ah well, I played Fallout 3 enough to be used to random dead people.
What's stranger is that Skjor has come back to life and says lines like "You still have to prove yourself Whelp" after I've been Harbinger of the Companions for quite a while.