SEATTLE (AP) -- Federal investigators have been unable to determine the cause of a fire that killed three Washington State Patrol employees at a home in Zillah.
The Seattle office of the Bureau of Alcohol, Tobacco, Firearms and Explosives said Tuesday the cause is undetermined.
Trooper Kristopher Sperry, Trooper Gary Miller and Communications Officer Anne-Miller-Hewitt died of inhaling smoke in the Aug. 16, 2010, fire at the Millers' home.
The 55-year-old Miller was a veteran trooper. His 54-year-old wife headed the agency's emergency call center in Wenatchee. The 30-year-old Sperry was staying temporarily with the Millers.