On April 4, 1997, 10-year-old Anthony Martinez was forced into a white car in Beaumont, California. A forest ranger found the boy's nude body 16 days later, about 70 miles to the east.
After Duncan was arrested in the Groene murders, he was linked to the California crime by a fingerprint found on duct tape used to bind Martinez.
California wants to put Duncan on trial for the Martinez murder before evidence and witnesses in the decade-old case further deteriorate. Investigators said that Duncan has acknowledged his participation in the California murder and another one in Washington state, but his statements "fall short of a confession."
Duncan is suspected in the deaths of Carmen Cubias, nine, and Sammiejo White, 11, in Washington while he was on parole in July 1996.
"We believe we have custody," said Jean McNeil, of the U.S. Attorney's office. "This is a state-to-state matter. It will go through the governor's office, and the attorney general's office, and we are out of the loop."
Duncan already pleaded guilty in Idaho state court for the murders and kidnappings of Brenda Groene, her fiance, Mark McKenzie, and Groene's 13-year-old son, Slade Groene.
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Discuss The Duncan Case
Calif. Governor Wants Duncan; Feds Say He'll Stay in Idaho