Lester Holt revealed his plans to leave "NBC Nightly News." Why is he stepping down as anchor, and who could replace him? Here’s everything to know so far.

The newscaster will continue his full-time role as the lead anchor of NBC's "Dateline." Seasoned NBC journalist Lester Holt has announced that he is stepping down as the anchor of NBC Nightly News, joining a growing list of newscasters who are parting ways with NBC amid network shakeups.

Holt has been a calming presence at NBC News, where his unflappable and low-key demeanor helped the news division move forward after a period of tumult. He took over “Nightly” duties after his predecessor, Brian Williams, was removed following scrutiny of claims the latter made about the details of a reporting trip to Iraq.