Skyrim V: Skyrim

[Avilan the Grey]

Well, I've tried everything. I suppose it's time to abandon Sven to his eternal duel in The Bannered Mare and go pick up Lydia as my follower of choice.

There should be an option to turn off immortality...
Here we go: setessential <base_id> 0/1 - makes any NPC mortal or immortal.

Here is a list of the IDs for people.