Don't worry, not mine....!
Just watching some tripe on Dave about house refurbishes - apparently in the us of a it goes on a house's 'record' if a violent crime has taken place there. As, I imagine, would a 'haunting'!
Wy is this important? Why would it reduces house value?
Unless it was due to recurrent gang warfare, I wouldn't mind if someone knocked of someone else in a house I was looking at.