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They closed some 44 years ago, but Chicago's Union Stockyards profoundly shaped the development of the city and the modern world. Dominic Pacyga, a local historian and former stockyard worker, tells the story in his new book "Slaughterhouse.” Pacyga joins us tonight.

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Four suspects are in custody for the mass shooting in Chicago's Back of the Yards neighborhood. Paris Schutz has the latest.

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We take a closer look at what happened the night of the Back of the Yards mass park shooting, and examine Chicago's persistent violence, with Felicia Davis, Mayor Rahm Emanuel's deputy chief of staff, and Chicago Tribune reporter Peter Nickeas.

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Tonight's edition of Geoffrey Baer's Biking the Boulevards takes us on a tour through the McKinley Park and Back of the Yards neighborhoods.