Depends on the murder. If I knew it was a regular type crime, and everything was cleaned up and accounted for, I could do it. If it was something like the Dahmer childhood house or Gacy's house, I couldn't do it. I'd always wonder if there was something unfound, etc....
It's an interesting question, a similar one that comes up on gun boards is "Would you buy a suicide weapon or claim one after a family member's death?" It's interesting how many people do. I couldn't, it's way too much of a personal connection.