Authorities say a father and son found dead inside their lawn-service van in northern Texas died from carbon monoxide poisoning rather than what investigators initially believed was exposure to chemicals.
Collin County sheriff's Capt. Jim Moody identified the men as 72-year-old Lyle John Powell and 49-year-old Ross John Powell.
Moody says the two were working in a neighborhood in Lucas, northeast of Dallas, when they returned to the van and were quickly overcome by fumes from a generator.
The men died at the scene, and a sheriff's deputy and at least three firefighters who responded to the emergency call also were overcome by fumes and were treated at a hospital.
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