There are so few Murderers (who don't kill their wives) that are married.
Brimmer--from Death Lends a Hand is but we never see her.
Alex Benedict--from Etude in Black. "A lovely woman..remarkable woman" but she should have taken the blinders off years ago about her husband's filandering.
Nicholas Frame--from Dagger of the Mind...but she really doesn't count because she is the co-murderer.
Hayden Danziger--from Troubled Waters. She was terrific! Quite the independent thinker...I love that scene when she is on deck talking to Columbo, and her beautiful silver hair is blowing about in the breeze.
Harold Van Wyck--from Playback. Another interesting wife. Not as strong a personality as Sylvia Danziger, but a very gentle soul.
Oliver Brandt--from The Bye-Bye...(you know! ). She was just a materialistic witch.
And that is it. The rest of them either knocked off their wives or they were not mentioned, and maybe they weren't even married at all. Hmmmm...very curious....
Tony Goodland from "Greenhouse Jungle" was married. Although his wife didn't seem to think so! Of course Nelson Hayward from "Candidate From Crime" also was married. I don't think we're told about the marriage status of Marshall Cahill from "Mind Over Mayhem". He does have a son, so I believe we can assume that Cahill was at least one time married. The same situation holds true for Luis Montoya from "A Matter Of Honor". He has a daughter, though no wife is present. Guess what? The same holds true for Stephan Mueller, otherwise known as the Great Santini in "Now You See Him". He has a daughter, but no wife.
As for the ABC years... Max Barsini from the episode, "Murder: A Self Portrait" is married (to Mrs. Peter Falk) and has wife Number Three all planned out. He murders his first, ex-wife in the episode. Oscar Finch is married in "Agenda For Murder". Wesley Corman is married in "Uneasy Lies The Crown". The wonderful "wascally" Leon Lamarr from the story, "Death Hits The Jackpot" is also married. Finally, Fielding Chase is a widower with a step-daughter in "Butterfly In Shades Of Grey".
Cassa, you're right. I don't know why I included Tony Goodland. I suppose because it started out with him and Jarvis plotting the ransom and all that. But no, he didn't murder anyone. He was murdered.
Yours was a fun post and it was something I hadn't thought about. Keep up the fun work, Cassa!