What recourse do I have and can I opt to not pay the $80,000 balance to the seller?

I bought house a few years ago. I myself along with a few other people have had strange spirit type encounters. Come to find out that the seller’s father had passed away in the house. This we did not know until just recently. Had we known beforehand, we more than likely would have not bought the house. I do believe that the state law requires something like this to be disclosed to the buyer especially when we paid market value for the house.