The times are a-changin' over at "CBS Evening News." Just seven months after becoming the co-anchor on the network's evening news broadcast, John Dickerson is officially leaving CBS. Between his short-lived stint in the co-anchor chair and the mystery surrounding his departure, many fans are wondering if there's more to this story, and it's starting to seem like they may be right.

After a shake-up that led to Norah O'Donnell parting ways with CBS , Dickerson took over the coveted evening news co-anchor role back in January. In an October 27 Instagram post, Dickerson announced that he's leaving. "Local news: At the end of this year, I will leave CBS, sixteen years after I sat in as Face the Nation anchor for the first time," he wrote. "I am extremely grateful for all that CBS gave me—

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