DuPage County sheriff's office officials said Friday they are looking for a 21-year-old man who went missing from his Addison-area residence this week.
Authorities are looking for Mateusz "Matt" Rybarski, who was last seen by family members Monday at his residence in unincorporated DuPage County near Addison, according to a news release.
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Rybarski's unoccupied vehicle and backpack were found Thursday afternoon near Salt Creek in Addison, but after conducting a complete search of the area, police could not locate Rybarski.
The sheriff's office said Rybarski has a history of mental illness and has refused to take his prescribed medications. Officials think he may be heading to Montana by train or bus.
Rybarski is described as 5'11", 180 pounds, with blonde hair and blue eyes.
According to his Facebook page, Rybarski is a 2009 graduate of Lake Zurich High School and was taking classes at the University of Illinois at Chicago.
The university's athletic website lists Rybarski as once being a member of the men's gymnastics team.
Those with information are asked to call (630) 407-2400.