Fiction by Dean Koontz
Michael Mace dies at the beginning of this story, but he doesn't stay dead.
This is not a zombie book, however. Michael comes back as Something Else, but he's also still Michael.
It's a pretty interesting story, and in classic Koontz style you never have to wonder who the good guys and bad guys are. It's quite clear; if Michael were wearing a literal halo (and the bad guys forked tails) it would not be more plain.
This story has good characters and an interesting plot.
I also read recently by this author: The Bad Weather Friend