Past Katherine was born on September 8, 1963, and married to abusive police officer
Wayne Davis (
Gary Cole). Together, they had a daughter named Dylan (Hailee Denham). Wayne became increasingly violent, forcing Katherine to flee with Dylan, and seek refuge with her aunt, Lillian Simms (
Ellen Geer) on Wisteria Lane. While living there, Katherine befriended her neighbors,
Mary Alice Young and
Susan Mayer. One year later, she discovers that Wayne had found them after he dropped off a doll for Dylan, which Katherine takes away and puts on a dresser. That night, she discovers Dylan had tried to retrieve her doll and died when the dresser fell over and crushed her. Fearing Wayne’s wrath, Katherine and Lillian bury Dylan in nearby woods, and she leaves Wisteria Lane, adopting a girl very similar to Dylan from a Romanian orphanage. Katherine's rivalry with Bree continues despite their shared business.
Season 5 Katherine is unhappy when she realizes that Bree has used her recipes in her cookbook and leaves her to run the business while she publicizes it. Her resentment deepens when Bree hires Orson as an employee. Meanwhile, Katherine secretly begins dating
Mike Delfino (
James Denton), Susan's ex-husband. When Susan finds out about the relationship, she feels betrayed but eventually gives them her blessing. Katherine moves in with Mike, and Susan and Mike's son,
M.J. (
Mason Vale Cotton). Susan tells Mike and Katherine that she's marrying Jackson but is horrified to learn that Mike will no longer have to pay her alimony. Katherine deceives Susan by letting her think Mike will pay alimony regardless but doesn't tell him the marriage is a
green card marriage, afraid that Mike would leave her for Susan. When Susan wants to thank Mike herself, Katherine admits to the lie. Katherine and Mike elope to
Las Vegas, but Mike leaves Katherine at the airport when he learns that their neighbor,
Dave Williams (
Neal McDonough), plans to kill M.J. in revenge.
Season 6 In the
sixth season premiere, Mike breaks up with Katherine and decides to re-marry Susan. Katherine does not take this very well. Katherine eventually crashes the wedding and demands Susan publicly apologize, but Katherine's remains bitter. When
Julie is attacked, Katherine visits Mike while Susan is away at the hospital and kisses him. Katherine then tells Orson that Mike made a pass at her, hoping this will get back to Susan. Bree becomes concerned when she sees Katherine spying through Susan and Mike's windows. After Katherine throws a fit over Bree using one of her cake designs at a wedding they are catering, Bree fires her and advises her to seek professional help. Furious, Katherine keys Bree's car. Katherine's rivalry with Susan intensifies as she continues pursuing Mike. At a neighborhood watch meeting, Susan publicly threatens Katherine to leave her and Mike alone. Later, Susan accidentally shoots Katherine in the shoulder, mistaking her for the strangler when Katherine was once again spying through her windows. Later, Mike hears that Katherine has told M.J. that Susan is a bad mother, he coldly tells her off and warns her to stay away from M.J. When he leaves, Katherine stabs herself in the stomach with a knife that has Mike's fingerprints on it. Katherine frames Mike and he is temporarily sent to jail while she is in the hospital. Susan worries that Katherine has suffered a
nervous breakdown and asks Dylan to visit and have her mother committed for psychiatric observation. She then learns that Katherine has been telling Dylan that she, not Susan, was married to Mike. When Katherine realizes she's been caught, she has a complete breakdown and is institutionalized. Several months later, when Katherine returns to Wisteria Lane, she develops a friendship with
Robin Gallagher (
Julie Benz), who moves in with her. Katherine is surprised to learn that Robin is a lesbian and is confused when she develops feelings for her. Soon, the two become sexually involved. When their relationship is made public, Katherine and Robin decide to take a vacation in Paris while they work on defining their relationship.
Season 8 Katherine returns to the series in the final episode "
Finishing the Hat". Katherine has made a small fortune as the owner of a frozen food company in France. She returns to Wisteria Lane to offer Lynette Scavo a job as the head of her United States expansion. It is revealed she and Robin broke up three months after arriving in Paris as Katherine decided she would rather focus on her professional life. ==Reception==