September 6, 1917: From the Homicide in Chicago Interactive Database

According to the Homicide in Chicago Interactive Database, 29-year-old Lizzie Heimos died at Chicago's Wesley Hospital from a criminal abortion performed by an unknown perpetrator on September 6, 1917. 

Given the prevalence of physicians and midwives running abortion practices in Chicago at the time, it's likely that she availed herself of one of them.