Prior to "Twin Peaks", Cooper's strongest romantic relationship was his affair with Caroline Earle, the wife of his former partner, Windom Earle. Caroline had been under Cooper and Earle's protection for witnessing a federal crime Earle committed when he lost his mind, but on one night when Cooper's guard was down, Caroline was murdered by Windom. Caroline's death and his failure to protect her continues to haunt Cooper on his arrival to Twin Peaks, referring to a "broken heart" when discussing women with Truman and his deputies.