Scott Lee Kimball (born September 21, 1966) is a convicted serial killer, con man and fraudster from Boulder County, Colorado, who murdered at least four people over a two-year period; investigators strongly suspect him in as many as 21 other unsolved killings. For the first year of his murder activity, he worked as an informant for the FBI, which both paid him and protected him from facing justice over some of his fraud schemes. Almost none of the information he gave the bureau was of any use in prosecuting other crimes, and much of it later proved false; the case greatly embarrassed the bureau. The agent who oversaw him during this period was disciplined; he insists he was not the only one responsible for enabling Kimball.