The map contains exact locations of homocides from the 2000s to now. You can zoom in far enough to see the neighborhood the murder(s) happened in. I’m sorry that the site is primarily in Norwegian, but you should still be able to zoom around. Wonder of there’s a global map that’s that detailed.
Yes, however a lot of this information would not be publicly available in Germany or only with valid concern, e.g. birthday, car ownership, value of the estate.