Kathleen Early

Tension arises between Derek and Meredith's mother; Cristina is mesmerized by the lifestyle of working in the dermatology wing.

Tragedy strikes when Derek loses a pregnant patient with an aneurysm during surgery and Addison must deliver the premature baby; Izzie learns she does not have anemia as she first thought, but something much worse.

When someone breaks into a woman's house and murders her while she is video chatting with her parents, Avery's skills are tested when she interviews the only other witness, Tristan Jenkins, (Matt Lanter), an agoraphobic neighbor who is suffering from PTSD following the incident.