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Kirchmann was last seen in Sylmar, California on July 5, 1996. He was employed as a truck driver for a brewing company in Los Angeles, California in 1996. He told a co-worker he wanted to travel to St. Louis, Missouri for a few days, but it is not known if he ever arrived there. He packed his belongings before he left.
Kirchmann's car was discovered abandoned at Ontario International Airport in California on July 12, one week after he disappeared. There was no sign of Kirchmann at the scene and no indication that he boarded a flight out of the airport. He has never been heard from again. Some investigators theorize that he does not remember who he is and is hospitalized somewhere as a "John Doe" patient.
Some agencies may state that Kirchmann disappeared from San Fernando, California on July 12, 1996.