A man convicted of a horrific Idaho murder has been sentenced to life in prison for torturing and killing a 10-year-old boy in California in 1997.    Riverside County District Attorney spokesman John Hall says Joseph Edward Duncan III was sentenced to two life terms in Superior Court on Tuesday. Duncan had pleaded guilty and waived his right to an appeal in an agreement with prosecutors.  Duncan was charged with killing 10-year-old Anthony Martinez after he was abducted while playing near his Beaumont home. Martinez's body was found two weeks later in the desert.   Duncan confessed after he was arrested in Idaho for the 2005 killings of two boys, their mother and her fiance and the abduction of the boys' sister.

     A call to Duncan's attorney Scott O'Meara wasn't immediately