When Miami CSI Lieutenant Horatio Caine comes to New York in pursuit of a murder suspect, Mac and his team help him discover the real killer and apprehend him ("" episode 2.23 "MIA/NYC Nonstop"). Mac later flies down to Miami to assist Caine in recapturing escaped murderer Henry Darius, who eventually heads back to New York. He meets Horatio's CSI Assistant Calleigh Duquesne. Together, the CSI detectives (Horatio and Mac) successfully apprehend Darius and extradite him to Florida ("CSI: Miami" episode 4.07 "Felony Flight", "CSI: NY" episode 2.07 "Manhattan Manhunt").