By Emanuella Grinberg, CNN
October 29, 2009 8:15 p.m. EDT
(CNN) -- A mother's plot to blame a stranger for killing her sons went awry when one of the boys survived and told police how Michelle Kehoe cut his throat, then moved on to his younger brother, an Iowa prosecutor said Thursday.
Police found the 7-year-old covered in dried blood in the family van the morning of October 27, 2008, in a secluded area near a pond east of Littleton. Beside the van, his 2-year-old brother lay dead, his throat also slashed.