Downers Grove, IL – Police in DuPage County are asking the public for help locating a 47-year-old man reported missing and considered endangered, last seen in Downers Grove late last week.
According to the Village of Downers Grove Police Department, Mark Sadelski was reported missing by his family on Friday, January 9, 2026. Officers say Sadelski was last seen near the area of 71st Street and Woodward Avenue in Downers Grove and is believed to have walked away from his residence.
Sadelski is described as a white male, standing 5 feet 11 inches tall and weighing approximately 275 pounds. He has grayish-brown hair, green eyes, and typically wears glasses. Police say he was last seen wearing a dark gray jacket, dark-colored jeans, and Skechers shoes.
Authorities say Sadelski has a medical condition that may place him in danger, prompting officials to issue an Endangered Missing Person Advisory, which was disseminated statewide on Monday, January 13. Local police departments and area hospitals have been notified and are assisting in the search.
Police emphasize that any information — no matter how small — could help bring Sadelski home safely. Residents in Downers Grove, surrounding DuPage County communities, and the greater Chicago metro area are encouraged to remain alert and review the provided photos.
Anyone with information regarding Sadelski’s whereabouts is urged to contact the Downers Grove Police Department at 630-434-5600.
This article was produced by a journalist and may include AI-assisted input. All content is reviewed for accuracy and fairness.
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