I'm listening to Immortality Inc. by Robert Sheckley. This was first published in 1959 and Matt Groening must have read it at some point to come up with Futurama. Thomas Blaine, a yacht designer who dies in a car accident in 1958 has this corporation from the future use time travel and other technology to put his mind into someone else's body in 2110.
It is a crazy, funny future, like Futurama and there is heavy emphasis on the afterlife that has been discovered and what comes of that. Zombies are what happens when someone's mind/personality is put in a not-fresh body. Ghosts are what happens when the "death trauma" doesn't disperse the mind/personality but makes it insane. Our boy Blaine's attempts to navigate this new world are pretty funny at times. Its a good listen.