It is revealed that while on a visit to her sister, Martha discovered Mary Alice's secret. Martha decides to solve her financial difficulties by blackmailing Mary Alice by letter, but Mary Alice commits suicide after receiving it. Mary Alice's friends find the note when packing up her belongings and give it to Paul. He hires a private eye/hit man to discover who was responsible and kill them. Paul discovers Edie has the same stationery but Edie stole it while living with Martha. Paul confronts Martha and she explains that she was desperate for money and Mary Alice killed herself because of "what she did to that poor baby (Zach Young)". In a rage, Paul kills Martha by bludgeoning her with the blender and strangling her. He then buries her next to a forest hiking trail.