32-year-old victim Olga Marie Calderon

32-year-old mother stabbed to death

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Olga Maria Calderon was a 32-year-old mother working at a Walgreens in Chicago. On Sunday, September 6, 18-year-old Sincere Williams repeatedly stabbed her to death. According to the Chicago SunTimes, Williams arrived at the Wicker Park Walgreens in the 1300 block of North Milwaukee Avenue. He entered the store around 9:35 am on Sunday with the intent of robbing it.