Depends on how people can be brought back to life.

How easy is it to perform?
What does it cost?
->Ex: In Merlin to bring someone back to life another person must sacrifice themself.
Are there ways to stop it from working?
Are there any other effects of the death?
->Ex: Doctor Who, when he dies he regenerates. Basically becoming a new person, so in a sense that last doctor you loved is dead personality wise.

Then for the death itself they could of had an agonizing terribly painful death. 
That would still hold meaning regardless of Resurrection.