You Only Live Once is a 1937 American crime drama film directed by Fritz Lang and starring Sylvia Sidney and Henry Fonda. Considered an early film noir, the film was the second directed by Lang in the United States. At least 15 minutes were trimmed from the original 100-minute version of the film due to its then unprecedented violence. Despite the removal of such scenes, the film is widely considered an early film noir classic. The film is also known for being one of the first box-office bombs.

William Dennis Gargan was an American film, television and radio actor. He was the 5th recipient of the Screen Actors Guild Life Achievement Award in 1967, and in 1941, was nominated for the Academy Award for Best Supporting Actor for his role as Joe in They Knew What They Wanted. He acted in decades of movies including parts in Follow the Leader, Rain, Night Flight, Three Sons, Isle of Destiny and many others. The role he was best known for was that of a private detective Martin Kane in the 1949–1952 radio-television series Martin Kane, Private Eye. In television, he was also in 39 episodes of The New Adventures of Martin Kane.