Rogue by Jessica Lynch

Adam’s dead—but his new life is just beginning.
Adam Wright is a Nightwalker. A turned human who is the worst kind of paranormal.
And he hates it.
He didn’t want to be a Para. He was proud to be a human, serving his community as a Grayson police officer. Sure, he lost the love of his life to a shifter, but he wasn’t a fan of Paras even before that.
And now he is one.
Only one problem. As a former Ant, and with a seething hatred for the type of vamp that did this to him, Adam doesn’t have any clue how to be a Nightwalker. Between the unbearable thirst, the newfound strength, and a rage that has him seeing red, he’s teetering on the edge of staying grounded and going rogue.
Until he discovers that there’s a way for him to do both.
Slayers are the bogeyman of the Para world. With some grit, determination, and an enchanted dagger, Adam dedicates his new life to hunting down killers… even if it means he becomes one.