Question: what happened to the real dylan desperate housewives

title: Katherine Mayfair
text: Katherine begins spending more time with Susan and Mike 's son , M.J. ( Mason Vale Cotton ) and move in together . 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 . When Susan wants to thank Mike herself , Katherine admits not telling him that Susan 's engagement to Jackson is n't real , afraid that he would leave her for Susan . The couple elope to Las Vegas , but Mike leaves Katherine at the airport when he learns that their neighbour , Dave Williams ( Neal McDonough ) , plans to kill M.J. in revenge . M.J. escapes unharmed and Mike and Susan share a passionate kiss following the ordeal .