Latest 'Mad Men' references Chicago student nurse murders of 1966

Chicago Police Superintendent O.W. Wilson holds a photograph of a man he identified as Richard B. Speck, 25, in Chicago, July 16, 1966. Wilson said a warrant had been issued for Speck in connection with the slaying of eight student nurses. Fingerprints found at the scene of the slaying matched Speck's, Wilson said.  The Speck murders had a jarring effect on characters in the Sunday, April 8, 2012, episode of ''Mad Men.'' (AP Photo) <span class=meta>(AP Photo/ RS)</span>
April 10, 2012 4:58:56 AM PDT