By Brian Stelter, CNN
(CNN) - John Miller, who has moved back and forth between public service and journalism like few others in either profession, is doing it again.
This time he's leaving CBS News, where he has been a senior correspondent for two years, and joining the New York Police Department.
Miller announced his latest move on Thursday. He embodies something that is, for some media critics, a source of great concern: the so-called "revolving door" between the people who cover the news and the people who are being covered. For CBS, he's something else: a fount of great knowledge who will be almost impossible to replace.
David Rhodes, the president of the network news division, said Miller's decision was "a loss for CBS."
"He's been really great for us," Rhodes said in a telephone interview on Thursday.
CBS allowed Miller out of his contract with the network because, as Rhodes put it, "it would just be inappropriate to stand in the way" of a return to public service. Miller's exact title at the NYPD is not yet known. But he'll have a high-profile job in counterterrorism, reuniting with his former boss William Bratton, who was the commissioner of the police department in the mid-1990s and will return to that position in January.
Read more of Brian's article online here.