the insurance company over the alleged theft of some trophies; he used the proceeds to purchase his plane. At trial, he claimed he later recovered the trophies in his backyard but forgot to inform the insurer. Hansen entered into a plea bargain after ballistics tests returned a match between bullets found at the crime scenes and Hansen's rifle. He pleaded guilty to the four homicides the police had evidence for (Morrow, Messina, Goulding, and "Eklutna Annie") and provided details about his other victims in return for serving his sentence in a federal prison, along with no publicity in the press. Another condition of the plea bargain was his participation in deciphering the markings on his aviation map and locating his victims' bodies. Hansen confirmed the police theory of how the women were abducted, adding that he would sometimes let a potential victim go if she convinced him that she would not report him to police. He indicated that he began killing in the early 1970s. Hansen showed investigators 17 grave sites in and around Southcentral Alaska, 12 of which were unknown to investigators. There remained marks on his map that he refused to give up, including three in Resurrection Bay, near Seward (authorities suspect two of these marks belong to the graves of Mary Thill and Megan Emrick, whom Hansen has denied killing). The remains of 12 (of a probable 21) victims were exhumed by the police and returned to their families. Hansen was sentenced to 461 years in prison without the possibility of parole. He was first imprisoned at the United States Penitentiary, Lewisburg in Lewisburg, Pennsylvania. In 1988, he was returned to Alaska and briefly incarcerated at Lemon Creek Correctional Center in Juneau. He was also imprisoned at Spring Creek Correctional Center in Seward until May 2014, when he was transported to the Anchorage Correctional Complex for health reasons. Death Hansen died on August 21, 2014, aged 75, at Alaska Regional Hospital in Anchorage, due to natural causes from lingering health conditions. In popular culture Films Naked Fear (2007), about a serial killer who hunts naked abducted women in the remote wilderness of New Mexico, is loosely based on Robert Hansen. In The Frozen Ground (2013), John Cusack portrayed Hansen opposite Nicolas Cage as Sergeant Jack Halcombe (a character based on Glenn Flothe) and Vanessa Hudgens as victim-survivor Cindy Paulson. Television Bonanza final season 14 episode 'The Hunter'