Ghosts From Christmas Past by Mary Alford

Eight years ago. . . Charlotte Swenson was brutally attacked on Christmas Eve. Left for dead, her parents murdered, Charlotte remains suspended in a lifeless state. No one expects her to awake from the coma.
For eight years. . . a killer has hidden in plain sight. Watching. Waiting. Never letting down his guard, because he knows Charlotte has information locked away in her sleeping mind that can put him away forever.
Eight years. . . Dylan Parker loved. Visited. Prayed. Struggled to come to term with the realization his Charlie might never wake up. Though he might not be able to help free her from the darkness that holds her hostage, he can do everything in his power to find her attacker and bring him to justice.
Dylan joined the Bitter Creek, Wyoming sheriff’s department. Spent every spare minute of his life searching for answers. When the former sheriff retired, Dylan took over the position.
Through eight long years. . . Dylan has searched for clues. Wondered why a killer who showed such brutality would simply stop. But Dylan has no way of knowing, the killer hasn’t stopped, he’s just waiting for his next victim. The one that didn’t die. Charlotte.
After eight years. . . Charlotte Swenson is about to fight her way out of the blackness into a world she doesn’t remember. It’s up to Dylan to help her unravel past secrets of that Christmas long ago if they ever stand a chance at a future beyond so much death.