(Edmonds, WA)  --  Police say an Edmonds, Washington woman who was arrested for stabbing a man told investigators she planned to kill the man, eat his heart, and leave a note on his body so police would know she planned to kill again.  Authorities say 24-year-old Amy Brown is accused of stabbing the 29-year-old man in the chest late Sunday, in a room at a motel in Lynnwood.  Police say Brown reportedly told the victim, whom she had met through a Craigslist ad, that she was a serial killer.  The man, who was able to escape from the room and summon help, suffered a punctured lung and is being hospitalized.