Keith Hunter Jesperson ; The Happy Face Killer (Documentary) Keith Hunter Jesperson ; The Happy Face Killer (Documentary) Keith Hunter Jesperson ; The .\rbr\rbrSmiley Face Killer Robert Yates Serial Killer Documentary 25 Cromwell Street The Fred and Rosemary West Murders - Serial Killers Documentary . Keith .\rbr\rbr\rbr\rbr\rbr\rbrSerial Killer - Keith Hunter Jesperson the Happy Face Killer Documentary Keith Hunter Jesperson (born April 6, 1955) is a Canadian-born American serial killer .