This episode has a different premise ... a man has been accused of the murder the show revolves around, but he's already been arrested, charged, and now he's on trial! His defense revolves around finding a missing witness he can't describe well and few people believe exists.
The murdered many was a mafia type in a mafia family and probably "needed killing", but that's not an affirmative defense in a murder trial.
Now, here's my issue with the episode. It is JAM packed with great guest stars. In fact, it's SO jam packed with great guest stars that virtually none of them get enough screen time to justify their inclusion or let their fans really enjoy them. The most screen time is Michael Considine, who for me was the least attractive guy to get all the screen time. His whiny delivery in his roles ALWAYS annoyed me.