<P> MIKE is inhabiting the body of Phillip Gerard . His personality surfaces when Gerard forgoes the use of a certain drug . MIKE reveals that he and BOB once collaborated in killing humans and that BOB is similarly inhabiting a man in the town . Cooper and the sheriff's department use MIKE, in control of Gerard's body, to help find BOB ("without chemicals, he points".) </P> <P> Donna befriends an agoraphobic orchid grower named Harold Smith whom Laura entrusted with a second, secret diary she kept . Harold catches Donna and Maddy attempting to steal the diary from him and hangs himself in despair . Cooper and the sheriff's department take possession of Laura's secret diary, and learn that BOB, a friend of her father's, had been sexually abusing her since childhood and she used drugs to cope . They initially suspect that the killer is Ben Horne and arrest him, but Leland Palmer is revealed to viewers to be BOB's host when he brutally kills Maddy . </P> <P> Cooper begins to doubt Horne's guilt, so he gathers all of his suspects in the belief that he will receive a sign to help him identify the killer . The Giant appears and confirms that Leland is BOB's host and Laura's and Maddy's killer, giving Cooper back his ring . Cooper and Truman take Leland into custody . In control of Leland's body, BOB admits to a string of murders, before forcing Leland to commit suicide . Leland, as he dies, is freed of BOB's influence and begs for forgiveness . BOB's spirit disappears into the woods in the form of an owl and the lawmen wonder if he will reappear . </P> <P> Cooper is set to leave Twin Peaks when he is framed for drug trafficking by Jean Renault and is suspended from the FBI . Renault holds Cooper responsible for the death of his brothers, Jacques and Bernard . Jean Renault is killed in a shootout with police, and Cooper is cleared of all charges . </P>

Who killed laura palmer in original twin peaks