Question: Born in Pizzoferrato, Abruzzo, Italy on October 6, 1935, Sammartino was the youngest of seven brothers and sisters. Four older siblings died during his time in Italy. During his childhood, Sammartino's family hid from German soldiers in a mountain called Valla Rocca, during the latter stages of World War II. During this time, Sammartino's mother, Emilia, would sneak into their German-occupied town for food and supplies.

Despite a very long series of rematches against Graham, Sammartino was unable to regain the title. His final attempt was in Philadelphia, just a few days before Graham was scheduled to lose the title to Bob Backlund. The Philly match was the only documented instance of Sammartino losing a steel cage match, as he lost by accidentally knocking a bloody and battered Graham through the cage door. After his second reign ended, Sammartino leisurely toured the U.S. and the world. He wrestled then NWA World Heavyweight Champion Harley Race to a one-hour draw in St. Louis. He also wrestled and defeated Blackjack Mulligan, Lord Alfred Hayes, Dick Murdoch, Kenji Shibuya, and "Crippler" Ray Stevens. Also during this time, Sammartino began serving as color commentator for the WWF's syndicated programs, WWF Championship Wrestling and WWF All-Star Wrestling. On January 22, 1980, his former student Larry Zbyszko turned on him at the World Wrestling Federation's Championship Wrestling show. Sammartino, shocked and hurt by Zbyszko's betrayal, vowed to make Zbyszko pay dearly. Their feud culminated on August 9, 1980, in front of 36,295 fans at Shea Stadium. As the main event of 1980's Showdown at Shea, Sammartino defeated Zbyszko inside a steel cage. In his autobiography, Hulk Hogan claimed that his match with Andre the Giant was the real reason for the huge draw at Shea Stadium; however, the feud between Sammartino and Zbyszko sold out everywhere in the build-up to the show. In contrast, Hogan and Andre headlined exactly one card in White Plains, New York before they wrestled at Shea, and they drew a paltry 1,200 in a building that held 3,500. Sammartino retired from North American wrestling full-time in 1981, in a match that opened the Meadowlands Arena in East Rutherford, New Jersey. Sammartino pinned George "The Animal" Steele in his match. Sammartino then finished up his full-time career by touring Japan.

Using a quote from the above article, answer the following question: How did he turn on him?
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Problem: Chapter 27 is a 2007 biographical drama film depicting the murder of John Lennon by Mark David Chapman. It was written and directed by Jarrett Schaefer, based on the book Let Me Take You Down by Jack Jones, produced by Robert Salerno, and stars Jared Leto as Chapman. The film takes place in December 1980, and is intended to be an exploration of Chapman's psyche. Its title is a reference to J. D. Salinger's novel The Catcher in the Rye, which has twenty-six chapters, and suggests a continuation of the book.

The real Mark David Chapman is currently incarcerated at Wende Correctional Facility, on a guilty plea. Aside from two interviews with Larry King and Barbara Walters, both in 1992, he has not spoken with the media. However, Chapman did reveal the mechanics of his unraveling during those three days in New York City to journalist Jack Jones. The interviews were published in 1992 as Let Me Take You Down: Inside the Mind of Mark David Chapman, a book of Chapman's recollections of his act of violence. Chapter 27 is based on this text. The title "Chapter 27" suggests a continuation of J. D. Salinger's novel The Catcher in the Rye, which has twenty-six chapters, and which Chapman was carrying when he shot John Lennon. Chapman was obsessed with the book, to the point of attempting to model his life after its protagonist, Holden Caulfield. According to the British music magazine Mojo, the title was also inspired by Chapter 27 of Robert Rosen's book Nowhere Man: The Final Days of John Lennon (2000). Rosen's book explores the numerological meaning of the number 27, "the triple 9", a number of profound importance to John Lennon. Lennon was deeply interested in numerology, particularly Cheiro's Book of Numbers, along with nine and all its multiples. It was Chapman's goal, according to Rosen, to write Chapter 27 "in Lennon's blood". Like Chapman, Schaefer is a fan of both The Beatles and J.D. Salinger's novel The Catcher in the Rye, and said he began the script to try to understand "how someone could be inspired to kill anyone as a result of being exposed to this kind of beautiful art. It really bothered me, because Lennon and Salinger have always made me feel so much better, and so much less alone."

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The real Mark David Chapman is currently incarcerated at Wende Correctional Facility, on a guilty plea.