'MURDER, SHE WROTE'
When a wino revealed that he had seen a car peal away from where a body was dumped in an alley, Lt. Timothy Hanratty pounced on the information.
Lt. Hanratty: Did you get the license plate number?
Wino: Who do I look like? Dick Tracy?
Dick Tracy is a multiversal who exists in the TV Universe. The comic strip detective was portrayed on TV back in the 1950s by Ralphy Byrd, who also played the role on the big screen.
If there are pop culture references to Dick Tracy in other TV shows, we could attribute those to the Warren Beatty movie. And to have a movie made about him in Toobworld, then the televersion of Detective Tracy had to have been famous enough to guarantee box office returns on such an expensive venture.
So I do count the wino's retort as proof that Dick Tracy was real in the same world as Jessica Fletcher. And that means 'Murder, She Wrote' can be linked to 'Dick Tracy'.