Not really surprising that he won't be returning, and if he didn't call it quits he probably would have been fired. As bad as the Packers defense played at times this year, the special teams played worse. Stock is a good guy, sure, but anyone who campaigns to sign Derrick Frost probably should start thinking about moving to Del Boca Vista.
(Hat tip to Pack and Cheese for the news. Ben runs a pretty good blog over there, and has been on top of his game as of late.)