This article contains plot spoilers for the 2017 series of Twin Peaks.
- For the impostor, see Diane Evans (tulpa).
"I have been assigned a secretary. Her name is Diane ... She seems an interesting cross between a saint and a cabaret singer."―Dale Cooper[src]
Diane was assigned as Cooper's secretary on his first day working for the FBI, December 19, 1977. He described her as an "interesting cross between a saint and a cabaret singer," and addressed most of his tapes to her from that moment on, even ones where he appeared to be talking to himself.
She showed concern for Cooper, as she sent him flowers during his absence after taking a life for the first time.
One day in early 1988, Cooper stood outside of Diane's office and mentioned that she had not changed her hair and was wearing a dress she had worn before, but he noticed that she had indeed changed something in the room. He took a moment to figure it out and excitedly noted that she moved a clock twelve inches to the left. Before leaving, he requested a "damn great pot of coffee" made from Sally's ground coffee.
"Special Agent Cooper . . . Dale and I had dinner once. We ate Chinese. We had wonton soup, egg rolls, and Peking duck. That's the one where they inflate the bird with air, swelling it to over double its original size. Without a doubt the most delicious skin I've ever eaten, firm and at the same time delicate. And the meat itself takes on a flavor when slid into the mouth. . . . Well, I couldn't get enough of it."―Diane[src]
Soon after the Laura Palmer case was resolved, Cooper disappeared. Three to four years later, his doppelganger showed up at Diane's home in Philadelphia, and questioned Diane about FBI activities since he had been gone. They kissed, but Diane, initally happy to see him, immediately sensed he was not himself. The doppelganger, sensing her fear, then raped her, after which she was taken to a "gas station." An exact duplicate of Diane was created, which assumed her identity.
After BOB and the doppelganger were defeated at the Twin Peaks Sheriff's Department, Cooper linked hands with the eyeless woman he had met on the purple sea. Her face opened onto the red room and a fleshy mass containing Diane's face appeared in its place. The real Diane, who now had bright red hair and black-and-white nail polish, appeared in Naido's place, wearing the bathrobe Lucy Brennan had given her. Cooper kissed her, and she said that she remembered everything. She then looked past him at the clock on the wall, which was stuck on 2:53. Cooper told all those assembled that he hoped to see them all again, just before the room fell into shadow.
Cooper, Diane, and Gordon Cole walked through the basement of the Great Northern Hotel towards a locked door, from which a ringing tone was issuing. Cooper unlocked it with his old key to room 315 and said he needed to continue alone. He promised Diane and Gordon that he would see them at the curtain call, and stepped through.
Cooper was now determined to cross to fulfill a personal mission, and Diane accompanied him. They drove 430 miles down a road into the desert to a spot near some power lines, where Cooper determined that they had come to the right place. He kissed her one last time, saying that after they went through everything could be different. Cooper drove forward and their surroundings began shifting rapidly. Suddenly, they were silently driving at high speed down a road in the middle of the night.
Still silent, Cooper stopped at a motel and bought a room for the two of them. Meanwhile, Diane, sitting in the car, saw what appeared to be her twin step out from behind a pillar, staring at her. The other Diane disappeared as Dale returned with their room key. Inside, Cooper sternly directed her to turn off the lights and come over next to him. They had sex, mechanically, while Diane grew distressed, alternately looking away from Dale's face and covering it with her hands.
"Dear Richard, when you read this, I'll be gone. Please don't try to find me. I don't recognize you anymore. Whatever it was we had together is over."
Behind the scenesEdit
Diane's designs were made entirely by David Lynch and Laura Dern.
- The Autobiography of F.B.I. Special Agent Dale Cooper: My Life, My Tapes
- Twin Peaks: Fire Walk with Me (Mentioned only)
- Twin Peaks: The Missing Pieces (Mentioned only)
- Twin Peaks – season 1
- "Diane..." - The Twin Peaks Tapes of Agent Cooper
- Twin Peaks – season 2
- Twin Peaks – 2017
- ↑ 1.0 1.1 1.2 1.3 1.4 Twin Peaks – "Part 18"
- ↑ Twin Peaks – "Part 6"
- ↑ 3.0 3.1 3.2 The Autobiography of F.B.I. Special Agent Dale Cooper: My Life, My Tapes
- ↑ Twin Peaks: The Missing Pieces
- ↑ Twin Peaks – "Episode 5"
- ↑ Twin Peaks – "Episode 8"
- ↑ Twin Peaks – "Part 16"
- ↑ 8.0 8.1 Twin Peaks – "Part 17"
- ↑ Twin Peaks FAQ: TV Episode Questions
- ↑ The Complete Lynch by David Hughes
- ↑ 
- ↑ Sabrina Sutherland interview