Karen Morley
Karen Morley (1909-2003) is credited in the episode Knockover (1973) with the part of Mrs. Webber. I don't recall any mention of the name "Mrs. Webber" in the dialogue but I presume she's the murdered girl's landlady.
I only know Karen from her 1930s movies and can't for the life of me see any visual hint that she's the same actress that plays the part of the landlady, but there doesn't seem to be any other part that could be her.
Can someone confirm that Karen Morley = Mrs. Webber = the landlady in this episode?
(By the way, this is one of my favorite episodes. The scene in the hotel lounge has to be one of Kojak's funniest ever.)