[7] In January 2014, Macmillan's St. Martin's Press announced a two-book, eight-figure agreement with Day for a new "Blacklist" series.

[11] Day's Crossfire series has 13 million English-language copies in print and international rights licensed in over 40 territories as of January 2014.

[20] In April 2013, HeroesAndHeartbreakers.com[24] broke the news that Day's Crossfire series had been optioned for television adaptation.

[25] Kevin Beggs, President of the Lionsgate Television Group, confirmed the acquisition on August 5, 2013 in a press release.

[27] In June 2017, startup streaming entertainment company Passionflix began production of Day's Afterburn/Aftershock film adaptation.

[29] In July 2020, Day – with Lee Child, John Grisham, C. J. Lyons, Douglas Preston, Jim Rasenberger, T. J. Stiles, R L Stine, Monique Truong, Scott Turow, Nicholas Weinstock, and Stuart Woods, along with Amazon Publishing and Penguin Random House LLC – filed a lawsuit against book piracy entity KISS Library in the U.S. District Court for the Western District of Washington[30] for selling pirated copies of their literary works.

[31] In September 2023, Day – along with David Baldacci, Mary Bly, Michael Connelly, Jonathan Franzen, John Grisham, Elin Hilderbrand, Christina Baker Kline, Maya Shanbhag Lang, Victor LaValle, George R.R.

Martin, Jodi Picoult, Douglas Preston, Roxana Robinson, George Saunders, Scott Turow, Rachel Vail, and The Authors Guild – filed a lawsuit against OpenAI for "flagrant and harmful infringements of Plaintiffs’ registered copyrights in written works of fiction.