User blog comment:Jimeee/Skyrim 1.9 beta update adds Legendary difficulty and raises level cap (Updated Apr 8th)/@comment-1471082-20130408202914/@comment-5650829-20130408235250

It's not meant to happen, when he dies, he should stay dead after the Silver Hand kill him. This only happened with one of my characters after some time has passed and can't even kill him because he is marked essential.