Guest Stars Joanna Cassidy as Joan Hunt Nathalie Kelley as Dani Alvarez Jamie Bamber as Aiden Wells Khandi Alexander as Commissioner Beverly Travers Steven Culp as Eric Greyson Ann Cusack as Gail Whirley Rebecca Field as Suzie Foster Matt Servitto as Mr. Whirley Scott MacArthur as Rob Martin Co Starring Amy Vorpahl as CSU Tech Fontana Roderick McCarthy as Paramedic #2 Juan Alfonso as Paramedic #1 Anna Moon as Mary Kim Estes as President Diane Sellers as Charge Nurse Conrad Allan as Dr. Romas Jarasunis Gregg Martin as Jake Katie O'Connor as Chloe Pete Carboni as Lab Tech Dianne Curwick as Sue Greyson