 During a hospital shooting , Owen is shot and injured , attracting the sympathy of Cristina , who subsequently restores their relationship . 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 . When Cristina discovers she is pregnant , Owen is displeased with her desire to abort the baby , and the two separate from each other . 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 . After substantial thought , Owen reluctantly decides to accompany Cristina to the abortion , uniting the two . 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 . Feeling abandoned and disconcerted after an altercation with Cristina , Owen has a one @-@ night stand with a patient 's friend . 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 . Teddy and Owen eventually became friends again . After learning that she has been offered a job at Med Com , Owen fires her assuring her that he will be okay . He also fires April Kepner ( Sarah Drew ) because the hospital cannot afford to keep her due to her not being a Board certified . Months later , Hunt visits Kepner and rehires her as he realized he made a mistake . 
