The title of tonight’s episode, “So Long and Thanks for All the Red Snapper,” plays off a famous Douglas Adams title and quote from his Hitch Hiker’s books. And the plot of tonight’s story is no day at the beach. Actually, it is: There’s the murder of a surfer to investigate. And the investigation leads, somehow, to Lisbon’s ex-fiance, played by Shield and Sons of Anarchy regular Kenny Johnson.