Bill O'Reilly (born September 10, 1949) is an American conservative political commentator who hosted The O'Reilly Factor on Fox News from 1996 until 2017, after Fox News fired him. O'Reilly also hosted The Radio Factor (2002-2009) and Inside Edition (1989-1995).
O'Reilly has been criticized for claims he reported events in the Falkland Islands War between Argentina and the Kingdom of Great Britain and Northern Ireland incorrectly.  He also has been criticized by former Washington Post editor Jeff Morley for claiming he was outside George de Mohrenschildt's house when he committed suicide.
O'Reilly is known for his Killing series of historical nonfiction books, all written with Martin Dugard. The first five books in the series are about the violent deaths, or attempted assassinations, of historic figures. The two most recent deal with major episodes in American military history. These are:
- Killing Lincoln (2011; about the assassination of Abraham Lincoln)
- Killing Kennedy (2012; about the assassination of John F. Kennedy)
- Killing Jesus (2013; about the crucifixion of Jesus Christ)
- Killing Patton (2014; about the possibility of George Patton being assassinated)
- Killing Reagan (2015; about the 1981 assassination attempt on Ronald Reagan)
- Killing the Rising Sun (2016; about Harry S. Truman ordering the United States' bombing Japan and ending World War II)
- Killing England (2017; about the American Revolutionary War)
All of his Killing books have been made into television movies for National Geographic.
- Jeff Morley (January 30, 2013). "JFKfacts » Investigator’s tape exposes Bill O’Reilly’s JFK fib". JFK Facts. Retrieved 2015-03-10.
- Steel, Emily; Schmidt, Michael S. (2017-04-19). "Bill O'Reilly Is Forced Out at Fox News". The New York Times. ISSN 0362-4331. Retrieved 2017-04-19.