Four for the Morgue (1962)

This episodic detective film presents the cases of two New Orleans gumshoes. In once case they preserve the good name of a patrolman who is suspected of murdering a kleptomaniacal socialite. They then find the murderer of a bank robber whose corpse was found in a swamp. After that, they catch a psycho hitchhiker. Finally, they bring in the killer of a cabbie's wife and her little dog.