The only time Columbo lost his cool

[ficlopri]

It was in an ep with Robert Conrad as a guest star. Conrad played suspect Milo Janus. And Columbo outright and bitterly told him (before the last scene) that he thught that he (Janus) killed a sick lady's husband.

[EricIdlefan]

Now I remeber the usually easy-going and likable LT loosing his cool and it was unusual for him to loose his temper!!

[tv star collector]

Actually, in the very first episode ("Prescription: Murder"), Lt. Columbo "lost
his cool" when he accused Katherine Justice of being Gene Barry's accomplice
in the murder of his wife. Great episode, by the way.

[caladon]

He also lost his cool with Dr. Mayfield aka Leonard Nimoy in "A Stitch In Crime."