Roy Martin aka Roy Morgan is a burglar and former war-time Radio & Electronics Engineer who listens in to radio police calls, allowing him to stay one step ahead of the cops.
He Walked by Night is a 1948 American police procedural film noir directed by Alfred L. Werker and an uncredited Anthony Mann. The film, shot in a semidocumentary tone, is loosely based on the real-life actions of Erwin "Machine-Gun" Walker, a former Glendale, California police department employee and World War II veteran who unleashed a crime spree of burglaries, robberies and shootouts in the Los Angeles area between 1945 and 1946.
