This article contains spoilers from the 2017 series of Twin Peaks. If you are not up-to-date with the aforementioned television program, it is strongly recommended that you do not read this article.
Detective Don Harrison is a detective with the South Dakota State Police.
Harrison oversaw the interrogation of William Hastings in relation to the murder of Ruth Davenport. He later went with Detective Dave Macklay to search Hastings' home and car, finding a piece of flesh in the latter.
Constance Talbot later revealed to Harrison and Macklay the cause of death of a John Doe found in Davenport's bed to be decapitation. She then showed them a ring found inside the body, inscribed, "To Dougie, with love, Janey-E."