Death Calls (Mills & Boon Intrigue) by Caridad Piñeiro

He had to resist-for there could be no such thing as love for him. Five centuries ago Diego had vowed never to turn another with the bite of the undead. And though Diego knew the dark underworld of New York was no place for a human, his unslaked desire commanded that Ramona be his for one night….

But when the artist's life was threatened by a reclusive millionaire who had used Ramona's skills to build a forgery ring, Diego needed to unleash his inner demon to save her. Then he was faced with a choice-lose the woman he loved…or turn her with a vampire's kiss.