There is an excellent book called Embraced by the Light by Betty J Eadie. She tells the story of how she endured the process of dying, but returned from it.
It can very comforting to read about this for family members who have lost someone. It is available in paperback, and you may even find it in a used books store.
Interesting, too, is that she is Catholic, because church teachings never seemed to address any topics about death.