Mary Sullivan's nephew Casey Sherman has for years maintained that Albert DeSalvo did not kill his aunt and even wrote a book on the case pointing to other possible suspects in the Boston Strangler ... more 
Mary Sullivan's nephew Casey Sherman has for years maintained that Albert DeSalvo did not kill his aunt and even wrote a book on the case pointing to other possible suspects in the Boston Strangler case. less 
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WCVB - Boston
Thu, Jul 11, 2013 1:13 PM EDT