Question: does columbo's wife ever appear on the show

Answer: No, Shortly after the Columbo series ended its original run on NBC in 1978, despite objections from Columbo producers Richard Levinson and William Link, NBC executive Fred Silverman went forward in producing Mrs. Columbo as a spin-off to the original series. The information NBC released about the show was unambiguous about the fact that Mrs. Columbo in the new series was in fact the previously unseen wife frequently mentioned on Columbo.