The Night Vision by K. Sterling

A vision of a corpse in a stream. A man with a heart too wild and a soul too pure for this world.
Parks Service investigator, Agent Silas Shelby, isn’t supposed to chase prophecies. But when an oracle named Tony shows him the skull of a man he’s never met, obsession takes hold. The trail leads him to Tighe Ossor—a descendant of ancient warrior-hunters hiding in the Appalachian wilds.
Tighe walked away from his brutal pack to live free, only to be hunted by a necromancer bent on power. To protect him, Silas must rely on anthropology professor Lennox MacIlwraith, Agent Nelson, and their magikal found family of witches, hellhounds, and medics.
Together, they must outwit dark sorcery before the oracle’s vision comes true. But with destiny, danger, and desire colliding, can Silas save a man fate has already marked for death?