Click For Photo: http://i.dailymail.co.uk/i/pix/2017/11/19/06/467F719000000578-0-image-a-184_1511073881815.jpg
A letter newly released from the FBI's archives may prove that DB Cooper - the 1971 hijacker last seen leaping out of a plane with a fortune in cash - survived his apparent death.
The letter, which was sent 17 days after the robbery appears to contain information about the hijacking that was not released into the public domain until 13 years later.
Case - Cooper - Tale - Heist - FBI
If that's the case it might reveal not only that Cooper lived to tell the tale of his extraordinary heist, but that the FBI covered it up to hide their embarrassment at his escape, the leader of a team of private investigators told DailyMail.com.
The hijacking occurred on November 24, 1971, when a man calling himself Dan Cooper boarded a Boeing 727 at Portland Airport and announced shortly after takeoff that he was holding a bomb.
Plane - Seattle-Tacoma - Airport - Authorities - Cash
The plane was grounded at Seattle-Tacoma airport until authorities produced $200,000 in cash - the equivalent of $1,213,226 today - and Cooper released the passengers.
But he kept some of the crew on board and forced them to take off before opening up the back of the plane and parachuting out over the forests of Washington, clutching the money and clad only in a suit.
FBI - Cooper - Name - Died - Exposure
The FBI ultimately concluded that Cooper - whose real name is unknown - died of exposure, and last year they closed the case.
But a team of around 40 private investigators led by TV and film executive Thomas Colbert and his wife Dawna believe that Cooper is alive - and told DailyMail.com they have the evidence to prove it.
FBI - Reams - Information - Case - Series
They successfully sued the FBI and have obtained reams of previously undisclosed information about the case, including a series of five letters purportedly written by Cooper to the authorities.
Four of those letters were already known to the public, but now a fifth letter has...
Wake Up To Breaking News!