As often as we hear about ghosts and hauntings, it's rare that we hear about hauntings by the people who are most justified to exact revenge from beyond the grave. I'm talking about Murder Victims, of course, and you'll be happy to know that several killers have been harassed by the spirits of the unfortunate souls whose lives they took. Check out Freaked's "10 Murderers Haunted By Their Victim's Ghosts" to find out whose victims didn't take death lying down.

https://freaked.com/murderers-haunted/