A preliminary autopsy shows Byron "Low Tax" Looper died after a heart event.
The notorious figure in Tennessee politics was found dead in his East Tennessee prison cell Wednesday while he was serving a life sentence for the death of his political opponent, state Sen. Tommy Burks.
Tennessee Bureau of Investigation spokeswoman Kristin Helm said the autopsy report indicted Looper had a heart event, but she wouldn't say whether agents have ruled out foul play.
"TBI will await the final autopsy before concluding the death investigation and turning it over to the district attorney general," she said.
Tennessee Health Department officials wouldn't clarify what type of heart even Looper had before he was found dead.
Nearly two hours before Looper was found, a prison incident report shows he assaulted a pregnant female counselor and had to be restrained.