When NBC News fired Matt Lauer two years ago, the network said an employee accused him of "inappropriate sexual behavior in the workplace."

Now that employee, Brooke Nevils, is speaking publicly for the first time. And Nevils is saying that Lauer raped her. The disturbing account is detailed in "Catch & Kill," a book by Ronan Farrow that comes out next Tuesday.

Representatives for Lauer have not yet responded to CNN's requests for comment about the allegations.

Variety magazine published excerpts from Farrow's book, including quotes from Nevils, on Tuesday evening.

NBC News responded by saying, in a statement, "Matt Lauer's conduct was appalling, horrific and reprehensible, as we said at the time. That's why he was fired within 24 hours of us first learning of the complaint. Our hearts break again for our colleague."

Lauer's former show, the "Today" show, covered the new reporting from Variety on Wednesday morning.

"This is shocking. And appalling. and I honestly don't even know what to say about it," Savannah Guthrie said on the air.

These "are not allegations of an affair, they're allegations of a crime," Hoda Kotb said.

"We're disturbed to our core," Guthrie added.

Nevils told Farrow in an interview that the rape occurred while she was in Sochi, Russia, covering the 2014 Winter Olympics.

She says it happened after a night of drinking with Lauer and others at a hotel bar. Nevils said she had six shots of vodka. Lauer invited her up to his room but, according to Farrow, Nevils said she "had no reason to suspect Lauer would be anything but friendly based on prior experience."

Nevils told Farrow that once in the room, Lauer forced himself onto her and raped her.

"It was nonconsensual in the sense that I was too drunk to consent," Nevils said. "It was nonconsensual in that I said, multiple times, that I didn't want to have anal sex."

Nevils also told Farrow that she and Lauer later had sexual encounters that were consensual. "It was completely transactional. It was not a relationship," she said.

Nevils did not immediately report the alleged attack to NBCUniversal executives. She told Farrow that she confided in former "Today" host Meredith Vieira three years later, and Vieira urged her to get a lawyer and speak with NBC human resources.

Nevils did, and her attorney said that NBC took swift action at that point.

"My client and I met with representatives from NBC's Human Resources and Legal Department at 6pm on Monday," Nevils' attorney Ari Wilkenfeld said at the time. "Over the course of several hours, my client detailed egregious acts of sexual harassment and misconduct by Mr. Lauer. In fewer than than 35 hours, NBC investigated and removed Mr. Lauer. Our impression at this point is that NBC acted quickly and responsibly, as all companies should when confronted with credible allegations about sexual misconduct in the workplace."

After he was terminated, Lauer said in a statement, "There are no words to express my sorrow and regret for the pain I have caused others by words and actions. To the people I have hurt, I am truly sorry." He said that "some of what is being said about me is untrue or mischaracterized, but there is enough truth in these stories to make me feel embarrassed and ashamed. I regret that my shame is now shared by the people I cherish dearly."

After the news of his firing broke, multiple news outlets published stories with other allegations of harassment by Lauer.

But no allegation of rape had emerged until now.

Nevils has not responded to a request for further comment from CNN.

Her account is sure to prompt new questions about whether she felt protected by NBC. Farrow reports that she left the network in 2018 with a payout in the "seven figures."

NBC News chairman Andy Lack said in a statement on Wednesday morning, "Our highest priority is to ensure we have a workplace environment where everyone feels safe and protected. We are absolutely committed to making this a reality - there can be no exception."