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Khan opted for a lump sum of slightly more than $600,000. After taxes, the winnings amounted to about $425,000, said lottery spokesman Mike Lang. The check was issued on July 19, the day before Khan died. It was cashed Aug. 15, Lang said, explaining that if a lottery winner dies, the money typically goes to his or her estate.

Khan’s family could not be reached for comment.

Khan was pronounced dead July 20 at a hospital, but Mr. Cina would not say where Khan was when he fell ill, citing the investigation. The external exam showed no signs of trauma on Khan’s body.

No autopsy was done because, at the time, the medical examiner’s office didn’t generally perform them on people 45 and older unless the death was suspicious, Mr. Cina said. The cutoff age has since been raised to 50. After the basic toxicology screening for opiates, cocaine and carbon monoxide came back negative, the death was ruled a result of the narrowing and hardening of coronary arteries.

Days after the initial cause of death was released, a relative of Khan’s asked authorities to look into the case further, Mr. Cina said. He would not identify the relative. The full results came back in November.

“She (the morgue worker) then reopened the case and did more expansive toxicology, including all the major drugs of use, all the common prescription drugs and also included, I believe, strychnine and cyanide in there just in case something came up,” Mr. Cina said. “And in fact cyanide came up in this case.”

• Associated Press writer Don Babwin contributed to this article.