Preliminary results show a Silverhill mother and her teenage daughter had 4-times the lethal dose of carbon monoxide in their systems.
18-year-old Samantha Combs and Donna Henderson were found dead inside their mobile home March 9.
Police returned to the scene today to conduct more tests. They're trying to determine what caused the high levels of carbon monoxide in the home.
Chief Kim Wasdin tells News 5 they hope to release more information later today.
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