On the morning of December 30, 1978, deputies from the Arapahoe County, Colorado, Sheriff’s Office responded to the scene of a possible double homicide/suicide in a private residence in Littleton, Colorado.
A neighbor had discovered the bodies of a 45-year-old woman, her 17-year-old son, and her 15-year-old daughter. All three had suffered gunshot wounds from a .38-caliber handgun. The daughter, found partially clothed in her bed, had a bullet wound in her back. The son, also in bed, had been shot once in his upper chest. The mother’s body lay slumped over a typewriter in the basement with a bullet wound high on her forehead. A typewritten suicide note on the typewriter was signed with her initial.
As often is the case in intrafamilial homicide investigations, detectives interviewed the surviving spouse as a suspect.5 The husband, Robert Spangler, age 45, told investigators that he was not home during the crime. Spangler admitted marital problems with his wife and that he planned to leave her. He described leaving his house early that morning and finding sheriff’s deputies there when he returned. Spangler’s original story changed significantly in a subsequent interview. Two separate, private polygraph examiners found his answers inconclusive to questions about his role in the deaths. The .38- caliber weapon used in all three shootings belonged to Spangler, and evidence of gunshot residue was found on his right palm. On January 3, 1979, the Arapahoe County coroner closed the case as a double homicide/suicide.
The sheriff’s office was unable Special Agent Downes serves in the NCAVC’s Behavioral Analysis Unit in the FBI’s Criticial Incident Response Group. Special Agent Johns is assigned to the Crisis Management Unit in the FBI’s Criticial Incident Response Group. Ms. Bibles is the assistant U.S. attorney for the District of Arizona. August 2005 / 3 to overcome the coroner’s findings, and they had exhausted all investigative leads; therefore, they were forced to close the case. Most of the evidence either was returned to Spangler or destroyed.
Seven months later, Spangler married again. He and his second wife shared a common interest—hiking in Grand Canyon, Arizona. She eventually wrote a book of her experiences hiking the Canyon.
Subsequently, the couple began to have marital problems, and they divorced in 1988. In April 1993, Spangler and his third wife, age 58, backpacked in Grand Canyon, Arizona. This wife was an active aerobics instructor with five grown children and numerous grandchildren from a previous marriage. One morning in April 1993, Spangler appeared at a ranger station in the Grand Canyon and calmly told the ranger that his wife had fallen to her death. He explained that they had stopped to take a picture on the trail and, when he looked back, his wife was gone.
Rangers located the third wife’s body approximately 160 feet below the trail. The autopsy report concluded that she sustained massive injuries, including abrasions, contusions, lacerations, and multiple fractures of the neck, chest, and lower extremities. Spangler never was directly implicated in this wife’s death because it was ruled an accident. He drew national attention with interviews on several television shows.
As a grieving husband, Spangler discussed his wife’s accidental death and the dangers of hiking in the Grand Canyon. Spangler continued to backpack the Canyon with a variety of partners several times a year.
After the death of his third wife, Spangler reestablished contact with his second wife, who moved back into his Colorado home and died of a drug overdose in 1994. This death was not investigated by law enforcement.
In January 1999, perceptive investigators from the U.S. Department of Interior, National Park Service, and counties of Coconino, Arizona, and Arapahoe, Colorado, linked the cold case homicides in their respective jurisdictions. They met with agents from the FBI’s Flagstaff, Arizona, resident agency and requested assistance. An assistant U.S. attorney (AUSA) from the District of Arizona with experience in capital murder cases, who had a personal knowledge of the Grand Canyon, joined the team. The AUSA united the cases under the umbrella of federal jurisdiction as an insurance fraud/ murder, and an FBI agent in Flagstaff contacted the NCAVC.
First, NCAVC officials suggested that investigators complete a subject history on Spangler, stressing that investigators should familiarize themselves with all available information.Further, they recommended using an NCAVC Behavioral Assessment Questionnaire when interviewing some of Spangler’s associates. Early investigation revealed that Spangler was an educated, intelligent, and successful man. A charismatic individual, he worked in careers of human relations and public speaking. In addition, Spangler spent a significant amount of time living in different parts of Colorado and hiking the Grand Canyon. One lead set by the FBI agent resulted in an interview of a woman living in a small Colorado community who, subsequently, contacted authorities a few weeks after her interview. At that time, she gave them a copy of a letter she received from Spangler in which he advised her that he had terminal cancer.
The investigative team, with concurrence from the NCAVC, immediately approached Spangler. A complete confession was critical for prosecution because of the lack of existing evidence. The investigative team traveled to Colorado to interview Spangler, and the AUSA met them there to provide on-site legal consultation.
In Colorado, local law enforcement and the local FBI office supported investigators. Because any prosecution depends on the admissibility of a confession, the investigative During the course of investigation, Arapahoe County Sheriff’s Investigator Paul Goodman (co-case agent) directed the construction of an anotomically correct trajectory model depicting the bullet path and muzzle distance from Spangler’s first wife’s fatal gunshot wound.
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Team agreed to videotape the entire interview. Spangler’s terminal cancer created special issues for the AUSA regarding mental competence and the voluntariness of a statement.
For this purpose, the NCAVC provided a telephonic interview strategy: a medical doctor retained by their unit analyzed Spangler’s medical records, confirmed his terminal condition, and gave advice regarding competency issues.
Investigators approached Spangler at home and he agreed to an interview at the local sheriff’s office. The FBI agent and the Arapahoe County detective initiated the actual interview with the AUSA monitoring it from another room. The agent from the National Park Service observed the initial interview and participated on the second day. The first day of interviewing lasted about 4 hours. Spangler believed investigators when they told him that FBI profilers wanted to study him because he was a unique killer. Like some other serial murderers, his compulsion to kill even fascinated him.
Investigators confronted Spangler with the 1978 murders of his wife and children, the drug overdose of his second wife, and the murder of his third wife in the Grand Canyon. At the end of the interview, Spangler told investigators, “Well, you’re naming one communication link between Spangler and the investigators, allowing the interview to continue despite an overnight break.
During the second interview, Spangler told investigators how, while married to his first wife, he fell in love with another woman, then shot his wife and two teenage children to be with her.

He left, agreeing to contact investigators in the morning if he wanted to continue the interview. Contrary to expectations of the investigation team, Spangler telephoned the FBI agent the next morning and made an appointment to continue the interview after breakfast.

FBI Law Enforcement Bulletin said he smothered his son with a pillow after shooting him because the bullet wound was not lethal. He strongly denied involvement in the overdose death of his second wife and refused to discuss the death in the Grand Canyon because he feared a civil lawsuit from his third wife’s grown children. Investigators encouraged Spangler to talk about the Grand Canyon murder by telling him that killing several people at one time did not make him a serial killer. This approach worked on Spangler; after a period of silence, he said, “You’ve got your serial.”
Spangler then described how he masterminded the Grand Canyon murder and pushed his third wife over the edge while she faced him.