He spent much of his life in prison.ĭuncan's most violent string of crimes occurred in May 2005, when he was driving across the Idaho Panhandle on Interstate 90 and spotted two children playing in their swimsuits in the yard of a home next to the freeway. Duncan was cleared as a suspect in some cases, but authorities in California and Washington believed Duncan had committed unsolved murders in their jurisdictions.ĭuncan was a registered sex offender, telling a therapist that he estimated he had raped 13 younger boys by the time he was 16. He had been implicated as a possible suspect in several crimes that occurred between 19, when he was on parole, and between 20, when he was out of prison. The native of Tacoma, Washington, had recently been diagnosed with terminal brain cancer.

'He was held accountable.'ĭuncan, 58, died Sunday at a hospital in Indiana near the United States Penitentiary, Terre Haute, where he was on death row. 'His crimes were all publicly acknowledged and reviewed by a judge or jury,'' Whelan said Tuesday from Coeur d'Alene, Idaho. She prosecuted him in what she described as the only federal death penalty case in Idaho history. Attorney Traci Whelan believes all of Duncan's killings were revealed in court. Following his arrest in 2005 for the slayings of that Idaho family, the FBI reviewed unsolved missing child cases nationwide.Īssistant U.S. Some question whether Duncan, whose victims included four members of a single family, killed even more people. prison recently, having admitted to slaughtering seven people - including five children - in Idaho, Washington state, Montana and California. (AP) - Serial killer Joseph Edward Duncan III died in U.S.

Montana unsolved serial killers