Back in October 2022, there was linked a fancomic where Frasier and Niles tried to hide Maris' (partly) accidental murder from Lt. Columbo. It's now been voice-acted (not by the original actors of course) and put on Youtube. (12 minutes)

Note: The comic in the first post was on Twitter. It's also on creator Joe Chouinard's website, so I linked to it there. I try not to link to Twitter or Reddit now unless absolutely necessary. Also from Joe Chouinard, you might enjoy: - Niles and Crane in Bloodborne - the residents of Springfield participating in a fighting tournament - and the ongoing series Clown Corps, about crime-fighting clowns