Dana Delany Dr. Megan Hunt Actor Jeri Ryan Dr. Kate Murphey Actor John Carroll Lynch Detective Bud Morris Actor Nicholas Bishop Peter Dunlop Actor Sonja Sohn Detective Samantha Baker Actor Geoffrey Arend Dr. Ethan Gross Actor Windell Middlebrooks Dr. Curtis Brumfield Actor Mary Mouser Lacey Fleming Actor Joanna Cassidy Guest Star Jamie Bamber Guest Star Nathalie Kelley Guest Star Khandi Alexander Guest Star Ann Cusack Guest Star Steven Culp Guest Star Christopher Murphey Executive Producer, Writer Matthew Gross Executive Producer Sunil Nayar Executive Producer Michael Grossman Director