Keith Thornton dispatched his last call after four years with Chicago's Office of Emergency Management and Communications.
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The West Side native gained popularity on the night Officer Ella French was killed. He was able to guide officers to the nearest hospital and give officers on the scene a description of the offenders.
In his resignation note, Thornton mentioned he quit because he felt he and his colleagues were being neglected.
ABC7 reached out to the Office of Emergency Management and Communications and Mayor Lori Lightfoot's office. Both refused to comment.