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Cyanide killings can confound investigators

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Urooj Khan, a Far North Side who owned a dry cleaning business, had already been buried — and his death ruled by natural causes — when authorities realized he had been poisoned.

A relative came forward with suspicions he had been poisoned, leading the Cook County medical examiner’s office to run a second blood screen that showed a lethal dose of cyanide. Now authorities hope his exhumation Friday will shed more light on how he ingested the poison.

But simply finding the cyanide does not necessarily make a difference.

In the Tylenol case, the nation’s most infamous cyanide poisoning, investigators were able to detect the deadly poison almost immediately, but the murders remain unsolved more than 30 years later.

Seven Chicago-area residents died over a few days in the fall of 1982 after ingesting the cyanide-laced capsules.

Soon after victims starting collapsing, investigators were zeroing in on the poison that can kill in minutes.

“We figured there were only two likely elements that would kill so quickly: cyanide or nicotine,” said Dr. Edmund Donoghue, Cook County’s chief medical examiner at the time of a 1995 interview with the Tribune.

Nicotine was ruled out because it was used as an herbicide in the South, not in Chicago, Donoghue said at the time.

Toxicology tests would soon confirm the hunch, but one investigator working in the field those first days also figured it out — all because of its distinct almond scent.

Nicholas Pishos, an investigator for the medical examiner in the 1980s, recalled Friday that he was sitting inside a small intake room at Northwest Community Hospital with two bottles of Tylenol. They had been recovered from two different homes. He was on the phone with Donoghue.

“He said, ‘Can you snap them open?’ ” said Pishos, who had studied cyanide’s scent in college biology classes.

Pishos popped the bottles open.

“I said, ‘Whoops. I smell something. It smells like almonds,’ ” he said. “There is only a small amount of people who can smell it, and I happen to be one of them.”

The search for the Tylenol killer heated up in recent years when the FBI searched the Boston-area home of James Lewis, who was convicted in 1984 for extortion for demanding $1 million to “stop the killing” in a letter to Tylenol’s manufacturer. He has long denied any involvement.

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