FBI Closing File on DB Cooper Even if feds can't match DNA, they think they found their man: niece of suspect By Mark Russell, Newser Staff Posted Dec 5, 2011 3:41 AM CST 1 comment Comments This FBI sketch shows a rendering of the skyjacker known as 'Dan Cooper' and 'D.B. Cooper', from the recollections of passengers and crew of a Northwest Orient Airlines jet he hijacked in 1971. (AP Photo/FBI, File) (Newser) – The case of infamous skyjacker DB Cooper may never be officially solved, but 40 years after the brazen event, the FBI is preparing to close the case anyway, reports the Daily Mail. The woman who stepped forward earlier this year, claiming the notorious Cooper was her late uncle, says that the FBI came to her home to gather more of Dan Cooper's possessions for DNA analysis, after previous attempts to match his DNA failed. She says that the FBI believes her uncle was actually the skyjacker, but even if they can't solve the case conclusively, they will be closing the file soon. The feds aren't talking, but they have called the niece a "credible witness," notes Northwest Cable News.