Into Season 9, Susan meets a flight nurse named Chuck Martin (played by Donal Logue) on a plane to Las Vegas. They both get drunk upon arrival and end up getting married in Vegas. They quickly have the marriage annulled once they return to Chicago, but eventually start dating again, and Susan becomes pregnant. She is finally promoted to the position of Chief of Emergency Medicine after Robert Romano dies in Season 10. While other pregnant characters had given birth on the show, at the time, Susan's was the first major birth offscreen, with her giving birth sometime between Seasons 10 and 11 (and being placed on bedrest amid concerns of preterm labor). Chuck ends up caring for their baby boy Cosmo as a stay-at-home parent while Susan works.