My house is really old, and a long time ago would have had some live in servants & loads of outdoor workers. It's been in the family a while, so I can say that nobody has been murdered with some accuracy, but with that many people it's possible someone has committed suicide and it was covered up. And I suppose possible someone was murdered with a good cover up.
Plenty of people have died here, and not all peaceful deaths. I can only imagine how far from help it was before cars, and even in the 60's there was a death that would have been prevented with modern vehicles, or if they'd been in a town. Child birth, diseases, infections, illnesses, accidents etc won't all have been peaceful deaths before modern drugs and quick access to them.
And tbh, even if your house is a day old, chances are somebody died on the ground it's built on. Or was murdered.
Saying that though, another relative had a house that had half burnt down 200yrs or so ago, and several people died, some of whom were in the original part of the house that survived. I always felt uncomfortable in the original part of the house, but only because I knew that people had stood exactly where I was screaming and dying.