The King County Medical Examiner's Office said Tuesday that Earl Cossey, 71. died of blunt force trauma to the head April 23. The sheriff's office says his daughter found his body Friday when she went to check on him.
Cossey played a bit part in one of the Northwest's most enduring mysteries.
Cooper, whose real identity is not known, hijacked a plane in 1971. He released the passengers at Seattle-Tacoma International Airport in exchange for $200,000 and four parachutes.
He jumped out of the plane somewhere near the Oregon line. No one knows what happened to him.
Cossey was a skydiving instructor, and he packed the parachutes provided to the hijacker.
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