Niles: This is a snapshot of the murder victim with her pet monkey, Koko. He was given to her by another boyfriend, Clive Brisbane.
Frasier: Well, why wasn't Brisbane a suspect?
Daphne: Well, he was, but several witnesses saw him at the racetrack at the time of the murder.
Niles: Excuse me, is that Clive Brisbane the animal trainer?
Daphne: That's right. Brisbane's Amazing Apes. They opened in Las Vegas for Engelbert Humperdinck.
Frasier: Yes, it's easy to forget there was a time when Las Vegas wasn't the tacky place it is now.