Karen Lewis

Karen Lewis (June 26, 1953 – February 7, 2021) was an American Chicago Public Schools teacher and labor leader. She was the president of the Chicago Teachers Union from 2010 to 2014. She was a former King College Prep High School and Lane Technical High School chemistry teacher. She was a teacher for 22 years.
Lewis was considering running for Mayor of Chicago in 2015. In July 2014 poll, Lewis defeated Emanuel in a hypothetical electoral contest by 45-36 . She decided not to run for mayor due to health issues and endorses Chuy Garcia.
On October 9, 2014, Lewis was hospitalized for a "serious illness". At the time, no further details about Lewis' health have been revealed. On October 13, a source confirmed that Lewis had been diagnosed with glioblastoma. 
Lewis died from problems caused by the cancer in Chicago on February 7, 2021 at the age of 67.