My only concerns are resale value and the cleanup. If the place has no trace of the murder and a future buyer would not be able to easily connect a murder to it then go for it. If you google the address, does the murder show up? If so either stay away or offer less because you will likely get less if you sell it. I don't see why people care though. I remember someone looking at houses in Japan. He could get a great price if the former owner had commited suicide because no one wanted to buy them. Just in his local search there were several properties like this.