In the same documents, O'Reilly claims McPhilmy used the money she obtained from their agreement "to finance an existing extra-marital relationship."
Gawker speculates that extramarital relationship is between McPhilmy and her now-husband Jeffrey Gross, who's a detective with the Nassau County Police Department on Long Island.
The outlet noted they started dating after O'Reilly and McPhilmy separated in 2010, but before their divorce was final. O'Reilly reportedly responded to news of their relationship by getting the police department to launch an internal investigation of Gross.
Another filing reveals O'Reilly's attorneys have requested that all future filings related to this suit be kept under wraps. Neither he nor McPhilmy have yet to respond to requests for comment.
Photos of Bill O'Reilly hosting shows:
Bill O'Reilly is planning to sue ex-wife Maureen McPhilmy for $10M
WASHINGTON, DC - FEBRUARY 27: Bill O'Reilly, host of FOX News Channel's The O'Reilly Factor, waits for the arrival of U.S. President Barack Obama during an event about Obama's 'My Brother's Keeper' initiative in the East Room at the White House February 27, 2014 in Washington, DC. As part of his 'Year of Action,' Obama announced a $200 million commitment from nine foundations to bolster the education and employment of young men and boys of color. (Photo by Chip Somodevilla/Getty Images)
THE TONIGHT SHOW STARRING JIMMY FALLON -- Episode 0170 -- Pictured: Author Bill O'Reilly on November 25, 2014 -- (Photo by: Douglas Gorenstein/NBC/NBCU Photo Bank via Getty Images)
NEW YORK, NY - JUNE 18: TV Personality Bill O'Reilly attends An Evening with Bill O'Reilly and Geraldo Rivera at 92nd Street Y on June 18, 2014 in New York City. (Photo by Mark Sagliocco/FilmMagic)
NEW YORK, NY - DECEMBER 04: Donald Trump and Bill O'Reilly attend the game between the New York Knicks and the Cleveland Cavaliers at Madison Square Garden on November 30, 2014 in New York City.NOTE TO USER: User expressly acknowledges and agrees that, by downloading and/or using this photograph, user is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Elsa/Getty Images)
NEW YORK, NY - JUNE 18: (L-R) TV Personalites Geraldo Rivera and Bill O'Reilly attend An Evening with Bill O'Reilly and Geraldo Rivera at 92nd Street Y on June 18, 2014 in New York City. (Photo by Mark Sagliocco/FilmMagic)
TODAY -- Pictured: Bill O'Reilly appears on NBC News' 'Today' show -- (Photo by: Peter Kramer/NBC/NBC NewsWire via Getty Images)
NEW YORK, NY - OCTOBER 16: Bill O'Reilly attends the 11th annual Giants of Broadcasting Honors at Gotham Hall on October 16, 2013 in New York City. (Photo by Noam Galai/WireImage)
THE VIEW - (10.1.13) Today's guest co-host is Jason Biggs ('Orange is the New Black.') Guests include Bill OReilly (author, Killing Jesus); Matt Long and Lorraine Bruce (ABC's 'Lucky 7') on ABC's 'The View.' 'The View' airs Monday-Friday (11:00 am-12:00 pm, ET) on the ABC Television Network.
(Photo by Fred Lee/ABC via Getty Images)
BARBARA WALTERS, BILL O'REILLY
Regis Philbin talks with Bill O'Reilly, of the O'Reilly Report, during the Court TV celebration of it's 10th anniversary at American Park inside Battery Park in New York City on July 18, 2001. photo by Gabe Palacio/ImageDirect
Bill O'Reilly attends the benefit for Homeless Children on November 16, 1989 at Letizia Restaurant in New York City. (Photo by Ron Galella, Ltd./WireImage)