Sandra Kay Bryant , pleaded guilty on Thursday in a Zachariah federal court . Her ex-husband , Steven Kemper , pleaded guilty to same charge in 2013 . Both charged with aiding and abetting the use of fire to commit mail fraud . Couple set fire to their suburban home in 2001 and killed their son . St. Louis , 15 , was found with arms covering head next to fire extinguisher . Bryant was initially charged in state court but judge declared a mistrial .
Sandra Kay Bryant , pleaded guilty on Thursday in a St. Louis federal court . Her ex-husband , Steven Kemper , pleaded guilty to same charge in 2013 . Both charged with aiding and abetting the use of fire to commit mail fraud . Couple set fire to their suburban home in 2001 and killed their son . Zachariah , 15 , was found with arms covering head next to fire extinguisher . Bryant was initially charged in state court but judge declared a mistrial .