John Dickerson, a veteran of CBS News and co-anchor of “CBS Evening News,” is leaving the network at the end of the year.Dickerson made the announcement in a social-media post Monday.“I am extremely grateful for all that CBS gave me—the work,

John Dickerson said on Monday that he would depart CBS News at the end of the year, the first sign of what is expected to be a major shake-up at the network under its new corporate owners.