A friend bought a home where a murder-suicide occured. 3 people dead.
2 years after the murder I went with him to check it out after purchasing it. You could smell the blood even though it was cleaned up. Blood soaked in between the hardwood floors-he ended up ripping up floorboard in two rooms and replacing the underlayment as well.
He rents it out and tell everyone what happened. Always finds a renter.
The tell tail heart…