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Expertise: Pathology - anatomic, clinical and forensic. The chief medical examiner at the GBI, Dr. Kris Sperry, told jurors that it seemed likely that Thompson had ingested antifreeze twice, and it was the second dose that ultimately killed him. Cobb County medical examiner Brian Frist, who had ordered Turner to be exhumed, described the experiments he performed in which he put antifreeze into various food substances such as Jell-O and Gatorade. In his opinion, the antifreeze could have been introduced without changing the texture, behavior, or color of the food, so Thompson could have consumed it without suspicion.