.Kleasen was a suspect in the chainsaw murders of two Mormon missionaries on October 28, 1974. The two missionanriesidentifeid as Gary Darley who was 20 and Mark Fischer who was 19 had been invited to Kleasen's trailer in a trailer park in Austin, Texas, and later disappeared. After a tip the Travis County, Texas, police department searched the trailer and around the area of Kleasen's trailer and found body parts, a bloody watch belonging to Fischer and a name tag belonging to Darley. Kleasen was arrested and charged with the two murders. His trial began in 1975 and he was found guilty of murdering Fischer and spent 2 and a half years on death row, before he was acquitted in 1977 due to an illegal search warrant. Kleasen moved to England in 1990 and married his pen pal Marie Longley, who was from Burton-Upon-Humber, near Scunthorpe, England, after serving a sentence for federal firearms violations. In 2001 a new indictment for Kleasen came up when the use of DNA in the case found some new evidence. In August 2002 a battle ensued between the United States and England to have Kleasen extradited back to the United States to face a new trial but it never happened. On April 21, 2003, Kleasen died at age 70 at Belmarsh Prison, in London, England, of natural causes.