A groundbreaking new clue might finally unlock the long-standing mystery of the DB Cooper case, which has puzzled investigators for over 53 years.On November 24, 1971, a man using the alias Dan "DB" Cooper hijacked Northwestern Flight 305 over Portland, demanding a ransom of $200,000. After receiving the money, he parachuted out of the aircraft and vanished without a trace. Recently, on the 53rd anniversary of the hijacking, a parachute believed to belong to Cooper may have been discovered.The children of Richard Floyd McCoy II, a suspect in the case, have stepped forward with intriguing information. Chante and Richard III...