Guilty Bystander

Guilty Bystander is a 1950 American film noir directed by Joseph Lerner, and starring Zachary Scott and Faye Emerson. The film marked the last motion picture screen appearances for character actors Mary Boland and J. Edward Bromberg.

Exwife Georgia comes to him in a panic. Their son Jeff is missing and so is her brother Fred. She didnt go to the police after being warned not to by Dr. Elder, a business acquaintance of Freds.The drunken Max tries to confront Dr. Elder, but is knocked cold. He wakes up in jail to learn that Elder has been killed and he, Max, is the prime suspect. Georgia gives him an alibi, though, so Max is let out. ........

Source: Wikipedia