Mrs. Fremont is Jack Fremont's concerned wife.
When Jack was admitted to Sacred Heart, they found out his lung cancer was taking control and he wouldn't live through the night. Denise Mahoney attempted to get Mrs. Fremont to sign the DNR so her husband wouldn't suffer for any longer than he needed to, but Denise wasn't very polite. Eventually, J.D. tells her that nobody is ever ready to watch someone they love die. Her and her son Mikey get to say goodbye to Jack before he passed away. ("My ABC's")