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.

Lester Holt announced he is leaving 'Nightly News.' The same day, MSNBC ousted Joy Reid as well as three other anchors

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.