Gunsmoke

Newly falls in love with a woman he met while tending the injured after a tornado. It doesn't take him long to decide to ask to marry her. Doc notes an odd bruise on her arm and her lack of energy. After an exam he wars with his conscience over whether to tell Patricia that she's got a rare blood disorder. He tells Kitty, Matt, and Newly before he marries her. She dies shortly after in Newly's arms and prompts Newly to go back to studying medicine.