'Late Night' with Jimmy Fallon

Jimmy Fallon will officially be given the keys to NBC's "Late Night" franchise following Conan O'Brien's exit.

A person close to the negotiations who spoke on condition of anonymity because the announcement hadn't been made confirming the widely rumored change Sunday and said a news conference was planned for Monday.

All that's left is an official date for NBC's transition: Mr. O'Brien moving out West to take over for Jay Leno on the "Tonight" show and Mr. Fallon following in the next time slot.

Fallon was a "Saturday Night Live" cast member before leaving for a movie career in 2004. He has had mixed success, with his most notable role as a childlike Boston Red Sox fan and Drew Barrymore's paramour in "Fever Pitch."

He signed a deal with NBC in 2007 that was widely seen as a way to keep him in the fold until the time came for Monday's announcement.

NBC's announcement opens network television's "upfront" week, when fall schedules are set and presented to advertisers. NBC took the unusual step of announcing its schedule a month ago, and it has invited advertisers for a Monday sales presentation emphasizing all of NBC Universal's properties.