Fatal Demise by Carrie Davis

Death couldn’t keep him away…

Saint DuCane is exposed to a vampire hybrid virus. He has a choice, let it destroy him or take an experimental cure that could kill him. As much as he wants to live to be with Harley, there’s no guarantee the cure will even work. While not dead yet, Saint will be soon.
Nineteen months ago, Harley Brennan was told the love of his life died during his final mission while working for a mysterious government group. Harley gets the two biggest shocks of his life at once: an inhuman monster attacks him, and he’s saved…by his dead lover.