23. One Wonderful Day

Complete story — includes the ending

Flashbacks reveal that Deirdre, a drug addict, sold her baby to Todd and Angela Forrest, after which the couple moved to Wisteria Lane, changing their names to Paul and Mary Alice Young. Sometime later, a sober Deirdre tracked down the Youngs to take her son back, but Mary Alice stabbed and killed Deirdre to prevent her from taking Zach; the Youngs then buried Deirdre's body beneath their pool. In the present, Mike brings Paul to a desert quarry and interrogates him about killing Deirdre. Upon learning that Mike intends to kill Paul, Zach attacks Felicia and breaks into Mike's house; he runs into Susan and holds her at gunpoint. Tom finds out through his boss that Lynette tried to get him fired, and decides to be a stay-at-home dad, telling Lynette that it is now her turn to work for the family. When Carlos is being tried in court for assaulting Justin, John finally tells him that he was the one having an affair with Gabrielle. Rex begins to think that the reason for his deteriorating health is that Bree had poisoned him. He writes her a note saying that he understands and forgives her, and dies from a heart attack a few minutes later.