I Knew It Was You: Rediscovering John Cazale (2009)
- HD 1080
- Runtime: 39m.
- Status: Released
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- Languages: en
- Country: United States of America
- Director: Richard Shepard
- Stars: John Cazale, Al Pacino, Meryl Streep, Robert De Niro, Olympia Dukakis
- keywords: friendship, 1970s, biography, tribute, cancer, filmmaking, retrospective, short film
- Production_studio: Oscilloscope, RAT Entertainment, HBO Documentary Films
- Slogan: A Tribute to John Cazale
- providers: Fandor
- The I Knew It Was You: Rediscovering John Cazale is featured in the top rankings of 2009
- #53 in Top Documentary Movies of 2009
John Cazale was in only five films – The Godfather, The Conversation, The Godfather: Part II, Dog Day Afternoon and The Deer Hunter – each was nominated for Best Picture. Yet today most people don't even know his name. I KNEW IT WAS YOU is a fresh tour through movies that defined a generation.