John Lennon and Yoko Ono were "obsessed" with staying thin, according to "We All Shine On: John, Yoko, & Me" author Elliot Mintz, a close friend of the two.
John Lennon was gunned down outside his New York City apartment building, The Dakota, on Dec. 8, 1980, at age 40. Elliot Mintz wrote a memoir about their friendship.