Robert Rackstraw, who many researchers suspect could have been behind the infamous D.B. Cooper skyjacking, has reportedly passed away at the age of 75. Thanks to his ties to Oregon, where the legendary 1971 caper took place, as well as a checkered past which included faking his own death to avoid criminal charges and spending time in prison for grand theft, he wound up popping up on the proverbial radar of investigators looking into the case shortly after the skyjacking occurred.In 1978, the FBI briefly considered Rackstraw to be a person of interest in the case, but ultimately ruled him...