I'm racking my brain trying to figure this out. There is one episode where a woman commits murder on a man who cheated on her and also cheated on someone very close to her who lived overseas. One of the hints that makes Columbo crazy is that in the house of the victim, she accidentally turns up the heat. She had some sort of condition that made her cold. In the end, she confesses and her 'friend' is allowed to go free to fly back overseas. Ring any bells???