There was no letter today. Just a picture. It speaks for itself. A turtle beating Casey with his very own bat. Alas! He must be saved soon! JD says he cannot have kidnapped Tiny Casey because he was watching the Sopranos that night. Red Hot Mama has offered a handsome reward for the safe return of my little man. The others have yet to respond. How sinister. No one's off the hook yet, though. Not until Casey is returned and the kidnapper is identified.
Previous clues here and here.