From Kook Science
Dupree Poe (January 11, 1902 - April 1, 1965) was an American convict who spent over thirty years in the Oregon State Penitentiary for the murder of Silverton City Marshall Hans Iverson in 1932. Poe dedicated the 1950s to mounting a legal campaign for his freedom, including attempts to be repatriated to the People's Republic of China, having failed during the previous two decades in his myriad escape attempts. In 1963, Poe was paroled, at which time he was reported to have claimed the invention of a method of creating perpetual motion; it is unclear what became of this alleged effort after his release, if anything, as Poe died just over nineteen months later in a car accident.
- "OREGON'S STUBBORNEST CON: In Prison 31 Years, Poe Paroled", The Capital Journal (Salem, OR): 1, 20 Aug. 1963, https://www.newspapers.com/clip/121675145/oregons-stubbornest-con-in-prison-31-y/