The Ghosts of Highway 20 refer to a number of individuals who disappeared, or were victims of assault, rape and/or murder, along Highway 20 in the U.S. state of Oregon from the late 1970s to the early 1990s. John Arthur Ackroyd, a highway mechanic with the Oregon Department of Transportation, was a suspect in these cases. Detectives were able to prosecute the murder of Kaye Turner of 1978, for which he was sentenced to five life sentences for aggravated murder. Ackroyd pleaded no contest in the murder of his stepdaughter Rachanda Pickle and agreed to not seek parole for the murder of Turner. A case was developed against Ackroyd for the murders of Melissa Sanders and Sheila Swanson, but Ackroyd died before the case could be presented to the Lincoln County, Oregon grand jury. Marlene Gabrielsen was the only known victim to have lived and is the first known victim. Her case was not prosecuted.