Who killed Tammy Zywicki? Over 30 years, zero answers

College student Tammy Zywicki vanished on Aug. 23, 1992, as she drove back to Grinnell College in Iowa from Evanston. Her body was found nine days later. And more than three decades later, her murder remains unsolved. CBS 2 Investigator Brad Edwards revisits the gruesome case, and the search for the killer that Tammy's family has never given up. Produced by Dylan Van Sickle and Adam Harrington. ----------------------------------------------------------------------------- CBS 2 News Chicago brings you breaking news, weather, compelling exclusive content and award-winning investigative reports from the CBS 2 Investigators. Subscribe to CBS 2 News Chicago on YouTube :    / cbschicago   CBS 2 NEWS 24/7 LIVESTREAM: https://www.cbsnews.com/chicago/live/ CBS 2 NEWS ON PLUTO TV: https://pluto.tv/en/live-tv/62cdc75b1... CBS 2 NEWS WEBSITE: https://www.cbsnews.com/chicago/ FACEBOOK:   / cbschicago   TWITTER:   / cbschicago   GET THE CBS 2 NEWS APP: https://apps.cbslocal.com/chicago/