Found the death one (not about ghosts):
“In Most states, a death in a home, no matter how it occurred, is not considered a “Material Fact” and it’s not required to be disclosed. A murder could have occurred days ago and the seller does not have to let you know.
A death in a home, especially a violent death, can decrease the home’s value by 25% and increase its time to sell by up to 50% longer than comparable homes.”
Interesting. Thanks.