Preteen Andrea Wilborn died a cruel and violent death in the wine cellar of her family’s mansion. The killer had her kneel on the floor of the cellar and shot her in the back of the head, execution-style. Within hours, police had a description of the killer and a single suspect T. Cullen Davis, one of the richest men in America and the model for the villainous J.R. Ewing on the nighttime soap opera “Dallas.”

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