Dina Walker

Dina Walker is the mother of Brad Walker.

History
Dina came into the hospital with her son, Brad, when Brad had severe, intermittent abdominal pain. When his tests were negative, Alex Karev and Arizona Robbins wanted to run an exploratory laparoscopy. Dina's husband, Jim, initially refused, believing that Brad was just faking, but when Alex told him that Brad could die if he had what they thought he did, his parents agreed.

Brad was moved to the ICU after surgery and his parents were angry that the laparoscopy hadn't shown anything. However, Brad started bleeding from his chest and had to be rushed into surgery. He had a ruptured aortic arch dissection which was the cause of his pain.

Brad's surgery was successful and his parents were told he was doing fine. However, they were still angry that the doctors hadn't caught the problem earlier. Alex Karev confronted him, saying that if they'd taken Brad home like they wanted, he would have died.

Romantic
She is married to Jim Walker.

Familial
Her husband didn't believe their son when he said he had severe, intermittent abdominal pain. However, it turned out that Brad had a serious problem with his heart and needed surgery. His parents were told he was doing okay afterward.