Adam Mayfair (Nathan Fillion) is a gynecologist and Katherine's second husband, who knows something of Katherine's past in Wisteria Lane. Katherine is very jealous of any attention other women pay to her husband, and it is often implied that he has a history as a womanizer. It eventually comes to light that the couple left Chicago because of a lawsuit initiated by a patient named Sylvia Greene (Melora Walters) against Adam. The case had been settled out of court, with Adam allowing his wife to believe the patient was a nymphomaniac. When Sylvia arrives in Fairview hoping to rekindle a relationship with Adam, Katherine is furious and asks him to leave. While packing, he finds the note that Katherine's Aunt Lillian left for Dylan, which reveals Katherine's true mystery, and he decides he wants to leave her. In "Sunday," Dylan asks to meet with Adam to learn the truth about her father. Katherine first meets with Adam, who agrees to talk to Dylan in the interest of learning what she already knows but promises he will not reveal Katherine's secrets. Katherine tells him she wants to work on their marriage, but Adam says he is finished. In the fourth season finale, Adam tells Katherine that, though he is still finished with her, he is not finished with Dylan and wants to protect her from Wayne. He and Katherine attend Dylan's cello recital, with Adam planning to take Dylan and Katherine away afterward on a vacation. Wayne also attends the recital, unbeknownst to Adam, who had neither met nor seen a photo of Wayne. During the intermission, Wayne elicits Adam's help with a flat tire. Wayne knocks Adam unconscious with a tire iron, drives him to an abandoned shack, and beats him until he believes Adam is dead. Adam, who had only feigned death to get Wayne to stop, steals a car and rushes to save Katherine. He arrives as Wayne is preparing to shoot Katherine and struggles with him, taking his gun. Later, Bree takes Adam to nurse his wounds and he comforts Katherine after she shoots Wayne to death. This is Adam's last appearance. It is speculated that he divorced Katherine in between the five years in between the fourth and fifth seasons and his current whereabouts are unknown.