In the Heat of the Night 1967.
Starring Sydney Poitier and Rod Steiger.
Directed by Norman Jewison.
Soundtrack by Quincy Jones.
Murder mystery drama with low-key comedy in every scene (pay attention to the actors expressions!). It's a snapshot of Americana at the cusp of a monumental social shift - the South saw it coming but had no was to stop it.
Notable scenes; in store with Beach Richards, consoling Lee Remick, the autopsy and Purdy girl in Sheriff's office.