<P> Following the rescue of his colleagues, Robbins' health deteriorates and amputates her leg . He extends his stay at Seattle Grace until a replacement for Robbins is found, but when he learns that the replacement will send the exchange program to UCLA, he decides not to leave . Karev buys Meredith's old house from her, and Cristina becomes his roommate . Karev forms a friendship with new intern, Jo Wilson that eventually develops into romantic feelings towards each other . Alex admits his love for Jo, and the two kiss and become a couple . </P> <P> Alex's estranged father, Jimmy, who he hasn't seen in 18 years, is admitted to the ER as a patient . After being discharged, Jimmy plays with his band at a bar, and Alex spends several nights watching his father perform onstage . Unknowing that Alex is his son, Jimmy confides in Alex that he had another family that he hasn't seen in years . This made Alex upset and he punched Jimmy at the bar . Once returning home, Alex unleashes his hurt and anger on Jo for having encouraged him to reconnect with his father . His father returns suffering from symptoms of withdrawal and hallucinations of the past where more is revealed about Alex's childhood . Jimmy tells Alex he knows that he is his son and Alex yells at his dad stating that "I WAS THE DAD". His dad later goes into cardiac arrest and is brought into surgery, fate unknown . Alex kisses Jo at April's wedding wanting to start a family with her . That night his dad died, due to a mistake by intern, Shane Ross, and Alex is upset . He punches Ross and is later comforted by Meredith . </P> <P> Upon the completion of his fellowship in Pediatric Surgery, Alex is given an offer to work at Dr. Oliver Lebackes' private practice office, claiming that he will have more flexible hours and "a big fat paycheck". Alex takes this offer happily . Robbins is initially angered by this decision and thinks that Alex is choosing money over substance . Eventually she realizes that he has become a wonderful surgeon and that she is happy to see him go . He later discovers that he isn't happy working at the private practice and expresses a desire to return full - time to Grey Sloan . When Cristina leaves for Switzerland, she leaves Alex her share of the board, including her seat . </P> <P> Alex is fired by Dr. Lebackes when Maggie Pierce accidentally reveals to him that Karev was thinking about leaving the job . Webber recommended Bailey to fill Yang's board seat after she left, so Bailey and Alex fight over the chair . They both make presentations to the board and eventually Bailey wins, with a unanimous vote in her favor . He is hired back as an attending Peds surgeon and takes over full - time as Arizona pursues a fellowship with Dr. Herman . Alex continues to date Jo and his friendship with Meredith grows stronger than ever, with him taking on the role of her new person . When Derek dies and Meredith runs away, Alex is upset by her leaving without telling him where she went and calls her everyday . Eventually she calls him, tells him she is okay, and to stop calling . When she goes into labor and gives birth to Ellis Shepherd, Alex goes to see her since he is her emergency contact . He brings Meredith and her kids back to her house . She asks to move back in with him in her old house . Alex sells Meredith back the house and he and Jo rent a loft . </P>

Who plays alex korevs mom on greys anatomy