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.

Lester Holt will leave his post as anchor of NBC’s “Nightly News” program this summer but remain at the network and expand his role hosting “Dateline,” he told colleagues in an announcement Monday. NBC did not immediately name a replacement for Holt, who has been anchoring “Nightly News” since 2015, when he took over for Brian Williams.

Lester Holt is ending his run as anchor of “NBC Nightly News” this summer, making him the latest high-profile news personality to exit a role.