Stating the Obvious
It’s pretty unsurprising that this realtor didn’t manage to sell this house, considering what they found inside. That is one heck of a nasty surprise to find! I can’t even begin to imagine what the smell must’ve been like, considering the body was there for two weeks in extreme heat.
Honestly, I don’t think that there’s much that you could actually do with a house like this when something awful has happened. The best thing I can think of is to just demolish the home entirely, as nobody will want to move into a place with this sort of dark history. Do you think you would be able to live in a house where someone died?