The fourth season of Only Murders in the Building might have just come to an end, but development on the next chapter of the story continues to move forward. Ta Leoni has joined the cast of the fifth season of the series, according to Deadline. The performer made a short appearance during the conclusion of the fourth season as Sofia Caccimelio. The character is involved in the new missing persons case Only Murders in the Building just established as its next mystery. No further details were given regarding what the character will be doing once she returns to the screen.