Query: When did Comcast formally announce its purchase of this cable provider?
Context: On April 8, 2005, a partnership led by Comcast and Sony Pictures Entertainment finalized a deal to acquire MGM and its affiliate studio, United Artists, and create an additional outlet to carry MGM/UA's material for cable and Internet distribution. On October 31, 2005, Comcast officially announced that it had acquired Susquehanna Communications a South Central Pennsylvania, -based cable television and broadband services provider and unit of the former Susquehanna Pfaltzgraff company, for $775 million cash. In this deal Comcast acquired approximately 230,000 basic cable customers, 71,000 digital cable customers, and 86,000 high-speed Internet customers.