Light Warriors (1 books in series)

In Twilight's Shadow (2008)
3.73 of 5 Votes: 5
review 1: The hero shows up injured to the heroines house and though she's been stripped o her powers and no longer a troubleshooter, she's obliged to help him. He's slowly loosing himself to the dark side and this manifests in the number of times he's had the overwhelming urge to kill her...