Fager responded to Duncan's request for comment, a journalistic standard, with an angry response telling the reporter she would be "held responsible for harming me" if she repeated the allegations without her own reporting on the subject. "However, he violated company policy and it is our commitment to uphold those policies at every level".
In the New Yorker report, Fager is accused of inappropriate touching and of tolerating an abusive culture.
Fager said in a statement that he was sacked because of the text message.
The investigation into Fager by an outside law firm is not complete.
His second-in-command, Bill Owens, has been put in charge temporarily.
He said he didn't think one note would have resulted in a dismissal after 36 years at the network, "but it did". In this second meeting, with his own lawyers also present, Moonves admitted he knew about the police complaint, and he also revealed the existence of another accuser, whom he was now working to silence by offering her a job at CBS.
A New Yorker report claims that 19 current and former employees said that after drinking at office parties, Fager touched employees in ways that made them feel "uncomfortable" and that he promoted an environment that "shielded bad behavior" - allegations Fager denies.
An article by Ronan Farrow in The New Yorker published in late July included allegations that Fager had encouraged a "frat house" atmosphere and ignored complaints about harassment from a number of women, even after CBS had paid financial settlements to three employees of the newsmagazine. However, Moonves wasn't the only CBS honcho named and the spotlight was placed on Fager after Moonves' exit.
Jeff Fager of the show "60 Minutes Sports" speaks on stage during the Showtime panel presentation of the 2013 Winter Television Critics Association Press Tour in Pasadena, California January 12, 2013.
Moonves had already been in exit talks with CBS. In the end, she questioned why Moonves wouldn't just tell her that he had no intention of ever putting one of her shows on his network instead of just keeping her "hopping and hoping". Now, within a matter of days, both men have departed the network.
But when the LA Times followed up with a report that TV executive Phyllis Golden-Gottlieb had gone to cops past year, accusing Moonves of sexual and physical assault when they worked together in the 1980s - he admitted to the directors that he'd known about the police report but didn't tell the company because it was a "personal matter", the Times reports.