Unmasking D.B. Cooper (2007)

>Despite the publicity generated by Porteous's book and the 2011 television documentary, the FBI is standing by its position that Christiansen cannot be considered a prime suspect.[50][168] It cites a poor match to eyewitness physical descriptions, a level of skydiving expertise above that predicted by their suspect profile, and an absence of direct incriminating evidence.[201]

https://en.wikipedia.org/wiki/D._B._Cooper#Kenneth_Christian...

I do like the more recent evidence from the tie; it contains titanium shavings or fragments.

https://www.seattletimes.com/seattle-news/northwest/does-tha...

Someone claiming to be his widow on reddit: https://www.reddit.com/r/UnresolvedMysteries/comments/3sdg9u...

A great story at least :)

Comparing pictures: http://cbsnews2.cbsistatic.com/hub/i/r/2000/08/22/ca3bd939-a...

If you prefer listening over reading I can recommend https://www.stuffyoushouldknow.com/podcasts/sysk-live-db-coo...

Great story telling