The book "Killing Reagan: The Violent Assault That Changed a Presidency" is part of Bill O'Reilly's Killing Series and was published in 2015 by Henry Holt & Company. Written by Bill O'Reilly and Martin Dugard, this biography and history book explores the impact of a violent assault on the presidency of Ronald Reagan. Measuring 9.5 inches in length, 1.2 inches in height, and 6.4 inches in width, the hardcover book contains 320 pages and is illustrated. It delves into the United States in the 20th century and the lives of presidents and heads of state.