Investigators are trying to determine if a North Texas man sought in the slaying of his ex-girlfriend killed himself or froze during wintry weather.
The Grayson County Sheriff's Office on Monday said autopsy results are pending on Aaron Lynn Smith.
A murder warrant was issued for Smith after Thursday night's fatal shooting of Yvonne Gauthier. She was attacked at her home near Denison, 70 miles north of Dallas.
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Lt. Rickey Wheeler said Smith's body was found Friday afternoon in his pickup truck in Cartwright, Okla. Wheeler said investigators believe Smith died from a mixture of pills and alcohol, or he froze to death, or a combination. A rifle was recovered from the truck.
Smith's body was discovered when officers in Bryan County, Okla., checked a report of a suspicious vehicle.