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Owen Hunt During a hospital shooting, Owen is shot and injured, attracting the sympathy of Cristina, who subsequently restores their relationship.[7] Due to the emotional reverberations of the shooting crisis, Owen and Cristina decide to wed one another shortly after their reconciliation, not wanting to risk separation.[8] When Cristina discovers she is pregnant, Owen is displeased with her desire to abort the baby, and the two separate from each other.[9] In the fallout of resident Meredith Grey (Ellen Pompeo)'s tampering with Derek Shepherd's Alzheimer's trial, Owen is promoted to Chief of Surgery after Webber steps down.[10] After substantial thought, Owen reluctantly decides to accompany Cristina to the abortion, uniting the two.[11] Owen's friendship with Teddy ends when Owen lies to Teddy about her husband's sudden death, due to Owen wanting her to finish a surgery she was currently performing and Teddy blaming Owen for her husband's death.[12][13] Feeling abandoned and disconcerted after an altercation with Cristina, Owen has a one-night stand with a patient's friend.[14] Cristina consequently finds out, terminates their relationship, and their marriage is tested. After Cristina passed her medical boards, she reconciles with Owen, but reveals to him that she is leaving Seattle to go to Mayo Clinic.[15] Teddy and Owen eventually became friends again. She had been offered a position at the United States Army Medical Command but chose to stay at Seattle Grace Mercy West out of loyalty. After Teddy's husband Henry dies she wallows in her grief and it affects her colleagues and residents, causing Owen to "fire" her so that she can have a fresh start elsewhere.[16] He also fires April Kepner (Sarah Drew) because the hospital cannot afford to keep her due to her not being a Board certified.[16] Months later, Hunt visits Kepner and rehires her as he realized he made a mistake.
Nathan Riggs Nathan Riggs is introduced in the sixth episode of the show's twelfth season as a new cardio attending at Grey-Sloan Memorial. It is quickly learned that he and Owen Hunt (Kevin McKidd) had been friends, but that their friendship ended acrimoniously. It is later revealed that Nathan and Owen's feud was caused by the disappearance of Owen's sister, Megan. Megan, who had been engaged to Nathan at the time of her abduction, had discovered Nathan's infidelity before running off and ultimately getting kidnapped. Owen has long blamed Riggs for the fate of his sister, who has been presumed dead for 10 years now. However, as time goes on, Nathan and Owen learn to work together and eventually tentatively reinstate their friendship.