In a new round of turmoil at the long-roiling NBC morning show “Today,” Jamie Horowitz, a former ESPN executive brought in 10 weeks ago to supervise the show, was fired on Monday after what several people at the network said was a series of conflicts with members of the show’s staff as well as the management of NBC News.

In a memo sent to the staff Monday evening, Deborah Turness, the president of NBC News, said that she and Mr. Horowitz “have come to the conclusion that this is not the right fit.”

Ms. Turness did not describe the decision as a termination, and referred to the move as something she and Mr. Horowitz had agreed upon together. But other NBC News staff members said flatly that Ms. Turness, and her superior, Patricia Fili-Krushel, who oversees NBC News, had determined that Mr. Horowitz had to go.

The move comes days after Page Six, The New York Post’s gossip site, reported new personnel conflicts at “Today” — which has had its share of those in recent years. The trouble, Page Six reported, was between the show’s long-serving and popular newsreader, Natalie Morales, and a newer member of the broadcast team, Tamron Hall.