Key Witness
- Aasta: 1947
- Riik: United States of America
- Žanr: Crime, Drama, Thriller
- Stuudio: Columbia Pictures
- Märksõna: inventor, film noir, murder, corpse
- Direktor: D. Ross Lederman
- Osades: John Beal, Trudy Marshall, Jimmy Lloyd, Helen Mowery, Wilton Graff, Barbara Read