<P> Thatcher and Susan Grey (Jeff Perry and Mare Winningham), Meredith's estranged father and step - mother, are introduced in season two, with Susan making appearances until her death in season three, and Thatcher continuing to appear on the series . Adele Webber (Loretta Devine), is introduced as Richard's wife, who eventually acquires Alzheimer's, in the seventh season, and continued to make appearances until her death in season nine . Introduced as Preston's mother, Jane Burke (Diahann Carroll) makes occasional appearances until the fourth season . Denny Duquette (Jeffrey Dean Morgan), a patient suffering from 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, 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, consisting of nine episodes, ending when Meredith reunites with Shepherd . </P> <P> In season three, 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 eight . A ferryboat accident brings along Rebecca Pope (Elizabeth Reaser), who is initially introduced as a pregnant Jane Doe victim, suffering from amnesia . Pope eventually embarks on a relationship with Karev, until she is diagnosed with a personality disorder in season four, 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 . </P> <P> The season four premiere introduces several new interns, to be trained under Meredith, Yang, Karev, Stevens, 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 a medical degree, and departs the show immediately after . Meredith and Shepherd's relationship reaches a toll, and the two separate, leading Shepherd to entertaining a relationship with Rose (Lauren Stamile), a nurse . Rose appears frequently until season five, when Derek and Meredith decide to rekindle their flame . Throughout the fifth season, Stevens experiences full - out hallucinations of Duquette, signaling that she is ill, and once she is lucid, he departs, marking his final appearance . Following the announcement of her relationship with Robbins, Callie's father Carlos Torres (Hector Elizondo) initially contests his daughter's concurrence in homosexuality, but eventually accepts it, and he reappears several times throughout the series . </P> <P> The hospital's merging with Mercy West introduces new residents: Dr. Reed Adamson (Nora Zehetner) and Dr. Charles Percy (Robert Baker), but the two are both murdered in the season six finale . Also introduced in the sixth season is Dr. Ben Warren (Jason George), an anesthesiologist and eventual husband to Dr. Miranda Bailey, as well as Sloan Riley (Leven Rambin), Dr. Mark Sloan's estranged daughter who seeks kinship with him . Dr. Lucy Fields (Rachael Taylor), an obstetrician - gynecologist, is introduced in the seventh season, and serves as a love interest for Dr. Alex Karev, until eventually relocating to pursue a career in Africa . Robbins receives a grant to aid children in Malawi, which leads to a falling out between her and Torres . While in Malawi, Robbins is replaced by Dr. Robert Stark (Peter MacNicol), a pediatric surgeon with an interest in Dr. April Kepner, who appears occasionally until season eight . Following the breakdown of Dr. Torres' relationship with Dr. Robbins, Dr. Sloan and Dr. Torres unite, and she becomes pregnant . Torres' relationship with Robbins is subsequently mended, and the couple endeavors to raise their new daughter, Sofia Robbin Sloan Torres, with the help of Dr. Sloan . Shepherd and Meredith also become new parents, with their adoption of Zola, a baby girl from Malawi . Conceived as a patient with a tumor condition who later develops diabetes, Henry Burton (Scott Foley) befriends Dr. Altman and eventually joins her in marriage only to get treated using her medical insurance, until he dies while undergoing heart surgery . </P>

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