Admired by actors and directors, adored by friends and lovers, yet unknown to most movie-goers, the venerable stage and screen actor John Cazale appeared in some of the most iconic films of the 1970's - Francis Ford Coppola's The Godfather, The Godfather: Part II and The Conversation, Sidney Lumet's Dog Day Afternoon and Michael Cimino's The Deer Hunter. The critically-lauded films collectively earned 40 Oscar® nominations, including 14 for Cazale's co-stars, and raked in millions at the box office. In 1978, just after wrapping The Deer Hunter, Cazale died tragically at age 42 and cinema was robbed of one its brightest. In I KNEW IT WAS YOU, director Richard Shepard talks with Cazale's co-stars and friends, Al Pacino, Meryl Streep, Robert DeNiro, Francis Ford Coppola, Israel Horovitz, Phillip Seymor Hoffman, Steve Buscemi and Sam Rockwell, and paints a loving tribute to a talent taken too soon. BONUS FEATURES: all new feature length audio commentary with director Richard Shepard; Al Pacino - interview outtakes; Israel Horovitz - interview outtakes; The American Way - dir. Marvin Starkman, starring John Cazale; and The Box- dir. Marvin Starkman, photographed by John Cazale.