<P> Katherine continues to pursue Mike, believing that he is still in love with her . Mike warns her to leave his family alone and claims he never truly loved her . After he leaves, Katherine calls 9 - 1 - 1 asking for an ambulance, and then stabs herself with a knife with Mike's fingerprints on it . Katherine frames Mike for her wound . Susan, realizing that Katherine has suffered a total nervous breakdown, calls Katherine's daughter, Dylan (Lyndsy Fonseca), who comes to town and has her mother committed for psychiatric observation . Susan later forgives Katherine once she recovers from her breakdown . Soon after, Mike reveals that he has accumulated an immense debt in the past year . Unable to balance their debt, Susan and Mike decide to move off Wisteria Lane and rent their house out temporarily . They move into an apartment across town while Paul Young rents their house on Wisteria Lane . </P> <P> Susan accepts an offer from her landlady, Maxine Rosen (Lainie Kazan), to appear on a website in which she does housework in her lingerie in order to make ends meet, though she keeps her new job a secret from her friends and family . Soon after, Maxine's site is merged with a larger company that uses Susan's image to advertise the website on billboards across the country . Susan pays the company $9,000 to have the billboards removed . As a result, she begins working for the website's video chatting services to earn back the money . Paul discovers her secret and threatens to expose it unless she sells him her home, in which he now lives with his second wife, Beth (Emily Bergl). Hoping to derail Paul's blackmail scheme, Susan tells Mike about her job on the website . Paul retaliates by spreading the word about Susan's involvement with the website, causing her to lose her teaching job . Strapped for money, Mike accepts a job on an oil rig in Alaska and Susan becomes Lynette's nanny . </P> <P> After purchasing a majority of the houses on Wisteria Lane, Paul announces that he plans to open a halfway house for ex-convicts on the street . A protest against his plan escalates into a violent riot and Susan is trampled by the unruly crowd . As a result, Susan loses a kidney and learns that her second kidney is deformed and she is at severe risk of renal failure . Susan reluctantly agrees to undergo dialysis while waiting for a transplant . After Paul throws her out, Beth submits paperwork indicating that in the event of her death, her kidney would be given to Susan, and then commits suicide . Despite initial refusal, Paul allows the operation to move forward and he and Susan reconcile . After discovering that Paul has been depressed following Beth's suicide, Susan begins cooking meals for him with the assistance of Felicia Tilman (Harriet Sansom Harris), Beth's mother and Martha Huber's sister, who secretly adds antifreeze to the food in an effort to kill him . Paul nearly dies as a result of the poisoned food . Unaware that Felicia is helping prepare his meals, Paul has Susan arrested for attempting to kill him . Eventually, Susan is released, Paul confesses to the murder of Martha Huber, and Felicia presumably dies in a car crash while fleeing town . Susan and her family move back onto Wisteria Lane . During a dinner party, Gabrielle's former stepfather, Alejandro (Tony Plana), who raped her during her childhood, attempts to harm Gabrielle until her husband, Carlos Solis (Ricardo Antonio Chavira) kills him . Susan, Lynette, and Bree agree to help cover up the crime . </P> <P> Susan begins to withdraw from her friends and family out of guilt for having helped cover up Alejandro's death . She bonds with Carlos over their mutual guilt . When Mike begins suspecting Susan and Carlos are having an affair, they agree to tell him the truth about the cover - up . Soon after, Susan begins taking an art class with renowned painter, Andre Zeller (Miguel Ferrer), and discovers that her guilt has given her a renewed artistic ability . In a series of paintings, Susan depicts the scene of Alejandro's death and subsequent burial, arousing the suspicion of Detective Chuck Vance (Jonathan Cake), Bree's embittered ex-boyfriend assigned to investigate Alejandro's disappearance . She briefly considers moving to New York to explore new career opportunities, but ultimately decides against it . In an effort to ease her guilt, Susan visits Alejandro's wife and stepdaughter, Claudia (Justina Machado) and Marisa (Daniela Bobadilla), respectively, and write them a check to help their financial misfortune, which only arouses Claudia's suspicions . Claudia confronts Susan and Gabrielle about Alejandro's disappearance, but agrees to stop prying after learning that he had been sexually abusing Marisa . </P>

Who gave susan a kidney in desperate housewives