http://www.telegraph.co.uk/news/worldnews/northamerica/usa/3489805/The-Vidocq-Society-Murder-on-the-menu.html
It's a lot more official than e.g. the Black Widowers, and cases have to be (a) at least two years unsolved and (b) presented by law enforcement professionals, not private eyes or amateur sleuths, but it apparently works.
Now if this doesn't suggest some interesting ideas for RPG scenarios, fanfic, etc. people really just aren't trying...