Generally, you are not required to share information about the house as long as you don’t hide anything or deliberately lie about anything. You do not have to offer information that your spouse or parent died at home, or that there was a suicide or even a murder in the home.
Keep in mind, however, that some buyers are more sensitive than others. If you sell to a sensitive buyer who might not have bought if she or he had known about the death, you could run the risk of a lawsuit after closing. In this case, the wiser choice might be to let the buyer know and let them make that decision with full knowledge – and sell to someone who doesn’t mind.