The Riverside County, Calif., district attorney’s office charged Duncan in January 2007 with the death of a Beaumont, Calif., boy.
In 1997, 10-year-old Anthony Martinez was forced into a car at knifepoint; his body was found 15 days later.
Duncan is eligible in Idaho for the death penalty after pleading guilty to kidnapping, torturing and killing Dylan Groene. His fate will be decided at hearings starting this week in Boise.
Duncan has already been convicted in state court of killing three people, including Dylan Groene’s mother and brother, in a May 2005 attack near Coeur d’Alene.
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