acquires Alzheimer's, in the seventh season, and continued to make appearances until her death in season 9. Introduced as Preston's mother, Jane Burke (Diahann Carroll) makes occasional appearances until the fourth season. Denny Duquette (Jeffrey Dean Morgan), a patient with congestive heart failure, originates as one of Burke's patients, who goes on to propose to Stevens, after weeks of bonding between the two. Facing death, Stevens cuts Duquette's left ventricular assist device (LVAD), to elevate his position on the United Network for Organ Sharing (UNOS) transplant list. This ultimately ends in his death season 2 finale, marking his initial departure from the show, and placing Stevens on disciplinary probation. Initially conceived as a veterinarian hired for Shepherd's dog, Doc, Dr. Finn Dandridge (Chris O'Donnell) soon becomes a love-interest for Meredith, while Shepherd is with Montgomery. Dandridge is included in a multi-episode story arc in seasons 2 and 3, consisting of 9 episodes, ending when Meredith reunites with Shepherd. In season 3, George's father, Harold O'Malley (George Dzundza), is diagnosed with cancer and dies, with his wife Louise (Debra Monk) and George's brothers Jerry (Greg Pitts) and Ronny (Tim Griffin) by his side. Louise goes on to appear occasionally, and was last seen in season 8. A ferryboat accident brings along Rebecca Pope (Elizabeth Reaser), who is initially introduced as a pregnant amnesiac Jane Doe patient. Pope eventually embarks on a relationship with Karev, until she is diagnosed with a personality disorder in season 4, and makes her final departure. Amidst the crisis of the ferryboat crash, Meredith falls into the water at the disaster site. Although rescued, she goes into cardiac arrest, waking up in what appears to be limbo. Within the limbo, Meredith is entertained by deceased acquaintances Duquette and Dylan Young (Kyle Chandler), who was killed during a bomb crisis in the second season, until eventually being resuscitated. Seeking a cure to her depression, Meredith undergoes therapy sessions with the hospital psychiatrist, Dr. Katharine Wyatt (Amy Madigan), who in addition, serves as a psychiatrist to Hunt. The season 4 premiere introduces several new interns, to be trained under Meredith, Yang, Stevens, Karev, and eventually O'Malley. Among them are Dr. Steve Mostow (Mark Saul) who continues to make appearances, and Dr. Sadie Harris (Melissa George) who formed a friendship with Meredith while the two were in college. Harris is fired in the fifth season, due to not actually having