In 2007, Leto starred in the biographical film Chapter 27. He portrayed Mark David Chapman, a fanatic fan of The Beatles and the murderer of John Lennon. Leto prepared for his role by relying on interviews with Chapman and on audiotapes recorded by a librarian the actor met during a visit to the inmate's hometown. Leto gained 67 pounds to approximate the killer's physique. The abruptness of his weight gain gave him gout. He was forced to use a wheelchair due to the stress the sudden increase in weight put on his body. After the shooting of the film, he quickly went on a liquid diet. Chapter 27 premiered at the 2007 Sundance Film Festival. Despite divided critical opinion on the film as a whole, Leto's performance was widely praised. Owen Gleiberman of Entertainment Weekly considered his acting "a genuine transformation, as the actor submerges himself in Chapman's couch-potato flab and red-rimmed eyes. ... Leto disappears inside this angry, mouth-breathing psycho geek with a conviction that had me hanging on his every delusion."
