<P> Amelia continues her downward spiral in the premiere, injuring herself at a bar falling down drunk . Sheldon picks her up and takes her to the hospital where she sutures herself up in private to avoid Charlotte . The two later find out Pete has had a heart attack and needs surgery . Furthermore, Amelia operates on Pete's brain while under the influence . Later, Amelia passes a breathalizer test, but is seen drinking alone at home in Addison's old condo . Amelia's friend with Huntington's disease returns from Italy and requests Amelia's help with physician - assisted suicide . Pete and Sheldon disagree over Amelia's decision to help her . Later, Amelia and Pete discuss Pete's past when he reveals he once assisted a dying patient . Later Amelia begins a benzodiazepine injection on her friend, who has an adverse reaction and requests to be saved before she stops breathing; Amelia rushes her to the hospital, where Pete tends to her friend . Shortly after discovering her friend had completed her own suicide after being rescued, Amelia consumes what is believed to be three OxyContin pills she palmed after discovering the friend's body . </P> <P> Following her friend's death, Amelia goes on a drug bender with a man she meets named Ryan . When she is caught by Addison doing drugs with Ryan, Addison kicks her out and they move into a hotel . Despite her friends' pleas to get help, Amelia begins writing prescriptions for herself until she is caught by Charlotte, who revokes her ability to write prescriptions . While high, Ryan proposes to Amelia and she accepts, giving him her father's watch . Soon after, Addison and the rest of the doctors stage an intervention for Amelia, but she resists until Addison discovers that she gave Ryan the watch . While telling the story, Amelia lashes out at her and leaves with Ryan . Later that night, Ryan dies from an accidental overdose . Eventually, Amelia is put into rehab, where she recovers from her addiction with the help of her co-workers at the practice, particularly Sheldon . In addition, Sheldon seems to display some romantic feelings towards Amelia, but she does not wish to pursue a romantic relationship . </P> <P> Several weeks later after being confronted by Sheldon, Amelia admits that she is 20 weeks pregnant with her deceased fiancé's baby . At the moment, she is struggling on whether or not she should keep the baby and therefore, is heavily depending on Sheldon for advice . In the end she decides to keep the baby, but then she finds out her baby boy will be born with no brain, resulting in her shutting down emotionally and pushing her friends away . She eventually decides to continue the pregnancy to term and donate her baby's organs when he dies, after a father of a patient she pronounced brain dead decides to donate his daughter's organs so that something good can come from her death . In the season finale, she ultimately gives birth to her anencephalic son with the help of Addison and Jake . During her labor, she wishes to be left alone, fearing that if anyone was with her, she would break down and show her emotions . At one point while going through a painful contraction, she asks Jake to leave her alone, and when he refuses, she breaks down crying, letting all of her fears out in the open . Additionally while she is in labor, Jake finally tells the practice of her plans for organ donation which divides the doctors . Some believe it was a courageous act, while others believe it was murder . Sam is against the organ donation and refuses to do the harvesting, but after a talk with Amelia, he ultimately changes his mind . When it comes time for her to push, Addison hears her cries from outside the room and walks in . Amelia initially refuses Addison, but later allows Addie to coach her . When her son is born, she initially does not want to see nor hold him and wishes that his head be covered . Before taking him away for the donation, she decides to hold her baby, where she lifts the cap from his head . When the baby goes into respiratory distress in her arms, she momentarily breaks down, wishing for more time, but, then hands the baby over to Addison for the donation . Her last words to her son are "Your daddy is waiting for you in heaven . His name is Ryan ." </P> <P> Later on in the series, she gets engaged to Dr. James Peterson, an ER doctor at St. Ambrose Hospital, but breaks it off by moving to Seattle . </P>

Who plays derek shepherd's sister on grey's anatomy