Richard Diamond TV show: "The Purple Penguin"

Kasey Rogers comes to see Diamond (David Janssen). She is afraid that her husband is about to be killed. Shortly afterwards the husband (Stacy Harris) shows up with his heavy, and mistakenly has Janssen roughed up, until he discovers that he is working for his wife. Then Harris agrees to double whatever his wife was paying Janssen. Later, when Janssen comes to the club, he catches Harris roughing up his wife, but goes to work for him anyway. He meets Chick Chandler, the club comedian, who hates Harris.

Then Harris is killed. Janssen dives into the investigation along with his buddy, Police Lt. Regis Toomey. The villain turns out to be Chandler.