No one likes the thought of death, especially a violent death in a home. In North Dakota Realtors do not need to disclose a person passing in a home or even if there are reports of a home being "Haunted".
As a Christian someone who passed away at home in peace has never concerned me. IE when my mother-in-law passed away she had a great faith in Christ and her family was by her side holding her hand as she died. So as it is said, "she died in peace". I know, with out a doubt, where her spirit is.
Realistically not everyone is a Christian and not everyone believes a departed spirit goes either to heaven or hell.
The point being: Some people are going to be uncomfortable with a death in a home no matter what the circumstances and once that is know to an agent (Buyer or Seller) it's time to move on when a Buyer makes it known that they are uncomfortable with a home because it has been disclosed that a death indeed occurred within a home.
I hate losing a sale when this situation arises but as Real Estate agents it is our duty to respect the living. My best advice to new agents is: When you receive a new listing that you know is an estate sale don't ask if the deceased passed in the home (your morbid curiosity may also upset the party listing the home). If the Selling party should disclose that the deceased did indeed pass in the home it is your duty to disclose that information if asked (and only if asked).