In the third season of Frasier additions to the recurring cast include Irene Olga Lopez as Marta, Maris' maid and go-between, Luke Tarsitano as Frasier's son, Frederick and Kate Costas (Mercedes Ruehl), the headstrong, ratings-obsessed new manager of Frasier's home radio station KACL, with whom a combative relationship rather unexpectedly morphs into a torrid romance in "The Adventures of Bad Boy and Dirty Girl," culminating with a poignant airport farewell in {"It's Hard to Say Goodbye When You Won’t Leave." In keeping with the first and second seasons former Cheers co-star Shelley Long makes a return appearance as Frasier's former fiancée Diane Chambers in "The Show Where Diane Comes Back." Daphne (Jane Leeves), although still oblivious to Niles' crush on her, manages to build a closer relationship with him when she teaches him how to tango in "Moon Dance."