If There's Anything I Can't Stand
Season 4 | Episode 404 | Aired 10/20/2007
Katherine's Aunt Lily comes to stay with her. She's dying and wants to tell Dylan the truth, but all she manages is a hint that there's a reason Dylan doesn't remember Wisteria Lane. We can't believe how far Katherine will go to keep her secret when she leaves Lily to die while keeping Dylan otherwise occupied!
But we know the truth will come out eventually: The note Lily wrote falls, unseen, under the bed.