Officials will do further testing after an autopsy Monday failed to show what killed a West Richland mother in an early-morning house fire last week.
Sandy St. George, 26, died Friday in her 701 S. 45th Ave. home. The blaze was reported just before 5:30 a.m.
An autopsy was performed by Dr. Daniel Selove, a forensic pathologist from Everett.
"We were unable to determine a conclusive cause of death," said Benton County Coroner John Hansens.
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He said further testing will be done to get "a definitive answer." Those tests could take eight to 12 weeks to complete at a state lab.
St. George and her husband, Thomas, had three sons, ages 1, 3 and 4, who were staying with a family friend and weren't home at the time of the fire.
Thomas St. George was treated at Kadlec Regional Medical Center in Richland for smoke inhalation.
The cause is being investigated by West Richland police and fire marshals from Kennewick and Richland.