The real estate market has never been hotter. Houses sell as soon as they’re listed. Bidding wars lead to all cash deals far above the asking price. But there is one kind of property that often sits on the market for years, no matter how much of a bargain it seems to be. Potential buyers come and go, the price keeps going down, and still the house stands empty.    In real estate jargon, it’s called a “stigmatized property” because the home comes with a history. An unfortunate one – a horrible death occurred here. But what few people know is exactly what happened.... or...