87th Precinct The Very Hard Sell (1961–1962) HD online

A car salesman is found dead in his car, shot with his own gun. The coroner believes it's a clear case of suicide, but the man's wife insists he would not have taken his own life. Lt. Carella searches for the man's last customer. His main clue is two strands of picture wire he finds tied around plumbing in locations where the customer and the victim were supposed to have met.

Episode cast overview, first billed only:
	Robert Lansing	-	Det. Steve Carella
	Ron Harper	-	Det. Bert Kling
	Gregory Walcott	-	Det. Roger Havilland
	Norman Fell	-	Det. Meyer Meyer
	Leonard Nimoy	-	Barrow
	Alice Frost	-	Mrs. Cornell
	Peter Helm	-	Andy Cornell
	Charlene Whitman	-	Stella
	Arte Johnson	-	Hotel Clerk
	Bill Zuckert	-	Donnegan
	Jackie Searl	-	Anton (as Jack Searl)
	Tom Greenway	-	Glenn Cornell
	Michael St. Angel	-	1st Policeman
	Jack Collins	-	Garcy
	Michael Fox	-	Grossman

This episode was based on a short story of the same name by Helen Nielsen, and not an 87th precinct novel, and the protagonist's name was changed to Steve Carella for the aired version of the story. It was something else in the original short story.