Desperate Housewifes season 6 episode 20 Epiphany
The Fairview strangler is revealed as Danny’s friend, Eddie. He has been living among the women of Wisteria Lane since childhood: He once caught Gaby and Carlos during an intimate moment as a child after spending time with her as they were both lonely; Bree offered him a job and some dating advice when he was younger, until she found out that he had a crush on her daughter, Danielle; Susan encouraged his passion for art, eventually paying for an art seminar for him; and Lynette will show him some kindness and generosity.
Eddie is shown at the beginning of the episode offering to buy his mother more alcohol when he goes out; making a point of telling her to stay out of his room. Once he leaves, she goes against his wishes and kicks in his door. Instead of finding the alcohol she believes hidden in his room, she finds the scrapbook he keeps of his victims under his mattress.