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This undated artist' sketch shows the skyjacker known as D.B. Cooper from recollections of the passengers and crew of a Northwest Airlines jet he hijacked between Portland and Seattle on Thanksgiving eve in 1971. The FBI says it's no longer actively investigating the unsolved mystery of D.B. Cooper. The bureau announced it's "exhaustively reviewed all credible leads" during its 45-year investigation. (AP-Photo, file)
This undated artist' sketch shows the skyjacker known as D.B. Cooper from recollections of the passengers and crew of a Northwest Airlines jet he hijacked between Portland and Seattle on Thanksgiving eve in 1971. The FBI says it's no longer actively investigating the unsolved mystery of D.B. Cooper. The bureau announced it's "exhaustively reviewed all credible leads" during its 45-year investigation. (AP-Photo, file)

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    Looking back at the D.B. Cooper manhunt (2011)

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Looking back at the D.B. Cooper manhunt (2011)

The D.B. Cooper manhunt has been one of the longest investigations in FBI history after he hijacked an airlines in 1971.

Looking back at the D.B. Cooper manhunt (2011)

The D.B. Cooper manhunt has been one of the longest investigations in FBI history after he hijacked an airlines in 1971.