Working on The Other Realm: Book Three of the Utgarda Trilogy, I have been researching people who have mysteriously disappeared, dutifully captured from Wikipedia.
Marvin Alvin Clark (born ca. 1851 – disappeared October 30, 1926) was an American man who disappeared under mysterious circumstances while en route to visit his daughter in Portland, Oregon during the Halloween weekend, 1926.
Clark’s disappearance made national headlines in 2011 when it was reported that a John Doe discovered in 1986 may have been him, though a positive DNA identification was unable to be made. Clark’s case has the distinction of being the oldest active missing person case in the United States.