In California, a seller must disclose if someone has physcically died ON THE PROPERTY in the past three years. They must also disclose going much further back if the death was notorious. For example, if someone famous died on the property, or if there were news reports about the death (ie: foul play). As with all disclosures in California, if a seller wonders if they should disclose something about the property... just disclose it. A seller doesn't want the buyer to find out about some horrible crime in the house from a neighbor, or from the lookie-loos that invariably swarm around notorious places, and lack of disclosure of known material facts can come back to haunt sellers in the form of lawsuits Other states may have other rules. Ask a local REALTOR, they will be able to answer your specific questions.