A source has confirmed the move, first reported by the New York Post, that Pelley will be giving up the anchor chair, which he's filled since 2011, and return as a full-time correspondent on 60 Minutes.
The move comes as "CBS Evening News", the network's flagship newscast, struggles with ratings.
There are no obvious replacements to Pelley inside the network, however, the name that came up the most in the past few months was that of Norah O'Donnell, the co-anchor of "CBS This Morning" along with Charlie Rose and Gayle King. Pelley is now overseas on assignment for "60 Minutes", where he is a contributor; he was unavailable for comment.
News of his departure broke unexpectedly Tuesday night, when reports spread of Pelley's office at the evening newscast being cleaned out. He once declared that its reporters couldn't last "10 seconds" at CBS News.
A source tells Deadline that Pelley's decision was based on failed contract negotiations with the network.
Grove writes that Pelley "is leaving the broadcast after years of friction with news division President David Rhodes", noting that Pelley was chosen for the job by former CBS News Chairman Jeff Fager. He will now be on 60 Minutes full time, after being a correspondent for the program since 2004.
A CBS source said, "Scott is really angry".
CBS was due for a change in its evening news.
Known for his sober and formal style, Pelley has served as a symbol of CBS' embrace of a hard-news ethos to distinguish itself from ABC and NBC. The program lost 9 percent of its viewers overall compared with May of a year ago and 14 percent of viewers aged 25-54, the key target audience for news advertisers.
"Insiders tell us the switch is ideal because the 60 Minutes position is prestigious enough that the network wouldn't have to deal with the p.r. headache of seeming to "demote" one of its most high-profile talents."
Ratings were also at play, according to the report.
They haven't necessarily been suited to the rush of news in the Trump era.