The character was portrayed by Dana Delany and first appeared in the series' fourth season premiere on September 30, , 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. 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.