Katherine Irma Davis Mayfair is a fictional character created by Marc Cherry for the ABC television series Desperate Housewives. The character was portrayed by Dana Delany and first appeared in the series' fourth season premiere on September 30, 2007, as the focus of the yearly mystery. Katherine is generally characterized by her cold demeanor and impressive domestic skills. Though initially a homemaker, Katherine started a catering business with neighbor Bree Van de Kamp (Marcia Cross), with whom she shares "a heated rivalry." She has been married twice, to Wayne Davis (Gary Cole) and Adam Mayfair (Nathan Fillion), but both relationships ended in divorce. Katherine has had two children; Dylan Davis (Hailee Denham), her daughter who died as a young child, and Dylan Mayfair (Lyndsy Fonseca), her adoptive daughter. The character was later paired with Mike Delfino (James Denton) in the fifth season, which later ended when he returned to and remarried Susan Mayer (Teri Hatcher), leading to Katherine's nervous breakdown in the sixth season. Later that season saw Katherine written into the series' first lesbian relationship with Robin Gallagher (Julie Benz). Delany left the series soon thereafter, when the character relocated to Paris indefinitely with Robin. Delany returned for a guest appearance during the series finale of Desperate Housewives in 2012. Delany's portrayal received praise from critics and audiences, with many critics attributing the improved quality of the series' fourth season to Delany's performance. The actress was a critics' favorite for a Primetime Emmy Award nomination for Outstanding Supporting Actress in a Comedy Series in 2008.