A Kiss Before the Apocalypse (Remy Chandler Series #1)
Remy Chandler lives a life he enjoys, with his dog and his wife. But now his wife is dying, age is something he doesn't have to deal with but she does, and there's nothing really he can do about it. He is an angel who decided to investigate what being human was like and found himself living among them. Deathless he can communicate with anything that has sentience and after several centuries he can put his hands to most jobs. He's investigating for a divorce case when the man shoots his lover and then himself and fails to die. What disturbs Remy more is that the man can see him for what he really is.
It's then that Remy finds out that the embodyment of death is missing, that he has a mission to find him and that there's rumours of an apocalypse, and his dog Marlowe needs a run in the park!
Marlowe steals the show in the book. I liked Remy and a lot of it reminded me of Pratchett and Gaiman's Good Omens, (only without the antichrist) I was quite pleased to see that there were sequels.