Kathleen Early

Meredith freaks out when Derek discovers her mother's old diary in the house and Cristina stumbles into a part of the hospital that she's never seen before.

Derek's confidence is shaken like never before as he faces off with Addison over what course is best for their dying pregnant patient.

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.