 Their remains were found on February 10, 1998, in Bothell, Washington.Duncan has been convicted by three courts; an Idaho district court, for the kidnapping and murders of Brenda and Slade Groene and Mark McKenzie; the United States District Court for the District of Idaho, for the kidnapping of Shasta and Dylan Groene, the murder of Dylan Groene, and other crimes; and a California superior court, for the kidnapping and murder of Anthony Martinez.Duncan first appeared in a Kootenai County court on July 13, 2005, where he was charged with three counts of first-degree murder and three counts of first degree kidnapping, all in conjunction with the deaths of Brenda and Slade Groene and Mark McKenzie.