
Key Witness
- Anno: 1947
- Nazione: United States of America
- Genere: Crime, Dramma, Thriller
- Studio: Columbia Pictures
- Parola chiave: inventor, film noir, murder, corpse
- Direttore: D. Ross Lederman
- Cast: John Beal, Trudy Marshall, Jimmy Lloyd, Helen Mowery, Wilton Graff, Barbara Read