Keith Hunter Jesperson (born April 6, 1955) is a Canadian-American serial killer who murdered at least eight women in the United States during the early 1990s. He was known as the "Happy Face Killer" because he drew smiley faces on his many letters to the media and prosecutors. Many of his victims were sex workers and transients who had no connection to him. Strangulation was his preferred method of murdering, the same method he often used to kill animals as a child.