Urban Fantasy, main character is older than he appears, works for villain who can appear in reflective surfaces

[Sarah]

Hello, my patron read this between 2000-2004 and she doesn't think it was an old book then but didn't think it was new either. Unfortunately she can't remember cover or any other details. I'm hoping you miracle workers out there can help us. :)





(view spoiler)[Near the end the main character is asked to kill a woman he might have feelings for. It's the second time he's been in that situation. At the very end, the main character drives off in a car at the end that has no reflective surfaces (hide spoiler)]