Dylan Mayfair (Lyndsy Fonseca) is Katherine's daughter. Dylan has no memory of "her" early years, and throughout Season 4, she unearths surprising news about her past, including her unknown friendship with Julie Mayer, whom she had never actually met since it was Katherine's original daughter, Dylan Davis, who was Julie's friend. One day, Dylan is driving, and a police officer pulls her over for speeding. Later, she finds out he is her father, Wayne, who she always thought had died. Wayne asks Dylan not to tell Katherine that they have met. Dylan meets Wayne a few times for dinner, telling Katherine that she is out on a date. Katherine follows Dylan one evening and discovers the truth, while Dylan and Wayne were planning to tell Katherine that they have been meeting. Wayne later discovers that Dylan is not his biological daughter after watching home videos of Dylan when she was young: while his daughter had a scar from a bike accident that needed 11 stitches, this Dylan's skin is unmarked. Katherine has no choice but to tell Dylan the truth about all the secrets: Katherine says that Wayne abused her, so she planned to leave town with the original Dylan. One day, Katherine has gone out for the evening and when she returns, Mary Alice (who was babysitting Dylan) tells her that Wayne came by and gave Dylan a doll, which the little girl would not let go of. Katherine takes the doll and puts it on top of a bookcase. Dylan tries to get the doll and the wardrobe falls on top of her, killing her. Katherine feels like she cannot go to the police because she believes Wayne will find a way to pin Dylan's death on her, so she buries her daughter in the woods. Katherine flies to a Romanian orphanage and adopts a girl who bears a striking resemblance to Dylan, to assume the identity of her deceased daughter.