Also agree… yet she missed that move, so it’s on with the game, a game that includes familiar patterns, e.g. killer offers up some kind of a red-herring (death threats)(always a nice little signal for Columbo), Columbo trails off looking for or forgetting something (where’s that paper?) and it is the murderer who brings the conversation back, in this case “Why is there no doubt about it?” So it’s about the evidence but it’s really about Columbo’s tactics, like earlier when he gave the whiplash schtick when she offered if there was anything she can do to help (let's play the absent minded game). Besides, it is true that the victim knew his killer, with all this coming right back at Kay as Columbo simultaneously flips the death threat thing on its head. Advantage Columbo.