As is, there's no way to do D&D style "walking dead" without just having a spirit possess a corpse (but often, there's better things for them to possess). Communicating with the deceased... No rules, certainly, but many traditions of magic believe in ancestor spirits and the like. If it came up in a game, I would say that expecting to simply ask a dead person what happened is out of the question, but "communing with ancestors" for a clue wouldn't be unreasonable.
Earthdawn is only "kind of" the past of Shadowrun; I believe since it's a game no longer owned by Catalyst, nothing in it is necessarily "officially canon" but I mean, it's at least worth considering.
And as always, remember the mantra of the Sixth World, should you ever try to perform true necromancy. "Everything has a price."