"My heart is obviously broken, because I don't know where my sibling is. He clearly disappeared into thin air," Monye's sister aid.
Ambrose Monye's siblings are desperate for any information.
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Monye, 28, was last seen on April 22, walking toward the university's John Crerar medical library in the 5700-block of South Ellis Avenue.
He is a University of Guadalajara student, in Chicago for a two-year clinical rotation at Jackson Park Hospital. He is expected to graduate in a few weeks.
Monye is described as a 5'10", 180-pound black man with black hair, brown eyes and medium complexion, police said.
Anyone with information about his whereabouts should call Special Victims Unit detectives at (312) 747-8380.