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Federal agents are also checking a link between Thornton and David Lee Williams, 35, of Atlanta, who died with 15 other sky divers two weeks ago when his plane stalled and plunged to the ground in rural Jenkinsburg, Ga. The plane's wing tanks were spiked with sugar, indicating sabotage. Thornton and Williams knew each other, and authorities speculate that they skimmed a cocaine shipment from Colombian drug suppliers. After Thornton's death, Williams became a target for revenge. His fellow sky divers, according to this theory, were just innocent bystanders.