BY TIM WILLERT twillert@opubco.com
Someone set a house fire that killed a couple but the exact source of the blaze is not known, arson investigators testified Tuesday, dealing a blow to the prosecution's case against a teenager charged with murder.
Tristan Owen, 17, is accused of setting the fire that killed Boyd Haynes, 87, and his wife, Doris Haynes, 86.
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