Behind Green Lights

Behind Green Lights is a 1946 American film noir directed by Otto Brower.

Complications ensue when a prisoner pulls his own switch, taking the place of Bards body to escape from the police station in an ambulance. Johnny Williams, the new reporter on the police beat, finds the missing body in a closet. He gets a scoop for his newspaper, and Carson gets his corpse back. The lieutenant notices there is very little blood for a fatal gunshot, so he orders another autopsy, by someone other than Yager.Then Nora Bard and Arthur Templeton voluntarily confess to him that they lied before. Nora was in her husbands apartment when he died. She had gone to plead for a divorce, and hid in another room when Janet Bradley arrived. After Janet left, Nora found Walter dying after drinking some liquor. When she ran out, she was seen by Templeton. He went into the apartment, assumed Nora had committed the crime, and staged the fake suicide to protect her. ........

Source: Wikipedia