A man and woman who authorities say schemed to defraud insurers out of hundreds of thousands of dollars are to be sentenced in St. Louis for their role in a 2001 blaze that killed their teenage son.

Steven Kemper and Sandra Kay Bryant are scheduled to appear Monday in federal court in St. Louis.

Both have pleaded guilty to one felony count of aiding and abetting the use of fire to commit mail fraud.

Investigators say the fire at the family's home in the St. Louis suburb of Florissant killed 15-year-old Zachariah Kemper after he became trapped in the basement that he shared with his mother while her mother, Steven Kemper and his lover lived upstairs. All of the adults escaped unharmed.