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Thompson, who was transporting the snake in his car, was later pronounced dead.
Sloat said an autopsy will be conducted and the snake will be held as evidence until it's determined how Thompson died.
Thompson worked at a pet shop in his hometown of Temple.
Several other animals found in the car with Thompson, who was unresponsive, were rescued by animal control. Those animals included another snake, six tarantulas and a bullfrog.
The Associated Press contributed to this report.