Richard Floyd McCoy, arrested six months after the DB Cooper hijacking, displayed striking similarities in his own hijacking, demanding $500,000 and parachutes in a manner reminiscent of Cooper. However, McCoy's escape was short-lived as the FBI found him with cash and parachutes, leading to a 45-year prison sentence. Some believe McCoy and Cooper may be the same person. Sheridan Peterson, a Boeing employee and skilled skydiver, drew suspicion due to a physical resemblance and remained a suspect until his death in 2021. Eric Ulis, an amateur sleuth, was 98% convinced of Peterson's involvement. Another suspect, Robert Rackstraw, an army veteran and helicopter pilot, became a late '70s suspect but never explicitly denied being Cooper. However, Rackstraw's age in 1971 contradicts the reported age of Cooper at the time.