It's one of the most notorious mysteries in the history of skyjacking. D.B. Cooper was last seen in November of 1971, wearing a business suit as he jumped out of the back of a plane carrying $200,000 in cash. He would have landed somewhere in the Northwest of the country, and the FBI has spent the past 45 years conducting one of their most thorough investigations to find out what happened to the skyjacker.
http://www.usatoday.com/videos/news/2016/07/13/87021672/
http://www.seattletimes.com/seattle-news/crime/case-closed-fbi-no-longer-looking-for-db-cooper/