Sorry, guys, you're mistaken. "Murder By Suicide", written by Frank D'Angeli, was purchased but has not been produced. I don't want to give away the plot, but it has no relation to "Columbo Likes The Nightlife", and is a completely different story.

Ted: The time frame, the lack of a known broadcast, and the similarity of title versus circimstance in Nightlife caused my speculation.

Thanks for the Detailed and apparent exact refernce point.