Guilty Pleasures (Anita Blake Vampire Hunter #1) by Laurell K. Hamilton

I don't date Vampires. 
I kill them.

My name is Anita Blake.
Vampires call me the Executioner.
What I call them isn't repeatable.

Ever since the Supreme Court granted the undead equal rights, most people think vampires are just ordinary folks with fangs.
I know better. I've seen their victims.
I carry the scars.

But now a serial killer is murdering vampires - and the most powerful bloodsucker in town wants me to find the killer.