So Lydia got killed by a troll next to a river, I push her in and watch her go down the waterfall. I head back to my Whiterun house 1 IRL day later to display an item and guess what?
Lydia was in the room she's always in. Only dead, Her body is laying in the doorway.

Has this happened to anyone else? Dead companion's bodies returning home for no reason? Please let me know.