Dylan Walsh Dr. Sean McNamara Actor Julian McMahon Dr. Christian Troy Actor John Hensley Matt McNamara Actor Roma Maffia Dr. Liz Cruz Actor Bruno Campos Dr. Quentin Costa Actor Kelly Carlson Kimber Henry Actor Joely Richardson Julia McNamara Actor Jessalyn Gilsig Gina Russo Guest Star Brittany Snow Ariel Alderman Guest Star Rhona Mitra Kit McGraw Guest Star Veronica Cartwright Mother Mary Claire Guest Star Kelsey Batelaan Annie McNamara Guest Star Willam Belli Cherry Peck Guest Star Colleen Flynn Dr. Allamby Guest Star Megan Paul Chelsea Myers Guest Star Brian Kerwin Eugene Alderman Guest Star Mary Ann Hermansen Sister Mary Claire Guest Star Linda Klein Nurse Linda Guest Star Alejandra Gutiérrez Spanish Woman Guest Star Tony Besson Paramedic Guest Star