Several years ago, I was asked to present a case overview to investigators involved in the infamous DB Cooper hijacking case. The original seminar was accompanied by a PowerPoint presentation to a closed audience. This presentation was also converted to a PDF file for the participants. Although the conversion process left a few unwanted artifacts and formatting issues, it accurately reflects the original presentation.
The case of DB Cooper (more correctly, Dan Cooper) remains unsolved.
Here is the PDF version of the original presentation: Vector 23