Stella Nickell laced ordinary painkillers with cyanide in two separate incidents that unfolded across Washington state in June 1986.
Her actions killed her husband and an unrelated woman, triggering immediate fears of random product tampering across the United States. Investigators later established that Nickell had staged the deaths to collect life insurance while disguising the crimes as part of a larger contamination scare. The case stood out because it combined domestic motive with deliberate public deception, forcing authorities to examine both personal relationships and commercial supply chains.
Nickell’s scheme relied on the existing memory of the 1982 Tylenol murders in Chicago. She purchased multiple bottles of Excedrin capsules, opened them in her home, and replaced the contents with a lethal mixture of cyanide and crushed tablets. She then returned the bottles to store shelves in several locations around Auburn and Kent. One bottle reached her husband, Bruce Nickell, who died on 5 June after taking the capsules for a headache. Eleven days later, bank manager Susan Snow ingested capsules from another contaminated bottle and collapsed at her home in Kent. Snow died the following day.
Background
Stella Nickell grew up in the Pacific Northwest and married Bruce Nickell in 1974. The couple lived in Auburn, Washington, where Bruce worked as a heavy equipment operator. Stella held various jobs, including work at a local aquarium store. Court records later showed that the marriage had deteriorated by the mid-1980s. Stella purchased several life insurance policies on Bruce between 1985 and 1986, with a combined payout value exceeding $175,000 in the event of accidental death.
Bruce Nickell had no known enemies and no history of suicidal behaviour. His death initially appeared consistent with the product-tampering fears that had lingered since the Tylenol case. Susan Snow, by contrast, had no connection to the Nickell household. Her death confirmed that at least two separate bottles had been poisoned and placed in circulation.
The Crimes
Nickell obtained potassium cyanide from a local supplier by claiming she needed it for cleaning goldfish tanks at the aquarium store. She mixed the poison with Excedrin powder and repackaged the capsules. Forensic examination later recovered traces of the same cyanide batch in both victims’ remains and in several unused bottles recovered from store shelves.
The timing of the purchases and returns allowed investigators to trace the bottles through store records. Nickell had bought the Excedrin in early June and returned at least four bottles to different outlets within a week. Two of those bottles contained the lethal mixture.
Investigation
Local police and the Food and Drug Administration initially treated the deaths as possible random tampering. Agents examined thousands of bottles across the region and issued public warnings. The breakthrough came when laboratory analysis showed that the cyanide in the Excedrin matched a specific industrial grade sold in small quantities to aquarium hobbyists.
Detectives visited every store that sold the cyanide and cross-referenced customer names with the victims’ social circles. Stella Nickell’s name appeared on a receipt. Further inquiries revealed the multiple insurance policies and inconsistencies in her account of Bruce’s final hours. Agents also recovered a second poison bottle hidden in her home that matched the crime-scene evidence.
Arrest and Trial
Federal authorities arrested Stella Nickell on 9 December 1987. She was charged with two counts of product tampering resulting in death and additional counts of mail fraud related to the insurance claims. The trial began in August 1988 in Seattle.
Prosecutors presented forensic matches between the cyanide, the capsules, and the store receipts. Witnesses testified that Nickell had discussed the insurance policies and had shown unusual interest in the earlier Tylenol case. The defence argued that the evidence was circumstantial and that the cyanide could have been introduced by an unknown third party. The jury convicted Nickell on all counts after three days of deliberation. She received a sentence of ninety years in federal prison.
Psychological Profile
Court-appointed evaluators noted that Nickell displayed a pattern of calculated deception rather than impulsive violence. She had researched both the insurance requirements for accidental death and the public reaction to the Tylenol murders. The decision to poison a second, unrelated victim was interpreted as an attempt to reinforce the appearance of random tampering and thereby deflect suspicion from her personal motive.
No evidence emerged of prior violent offences. The crimes appeared driven by financial gain and a desire to escape an unhappy marriage while collecting the largest possible insurance settlement.
Legacy and Cultural Impact
The case prompted stricter federal regulations on the sale of cyanide and other toxic substances. It also led to renewed emphasis on tamper-evident packaging for over-the-counter medications. Public confidence in consumer products suffered another blow, though no further deaths occurred from the same contamination.
Nickell remains incarcerated at the Federal Medical Center in Carswell, Texas. Appeals have been unsuccessful. The case continues to be studied in criminology courses as an example of staged product tampering used to mask domestic homicide.
Conclusion
Stella Nickell’s crimes combined personal financial motive with a deliberate attempt to exploit public fears of random poisoning. The investigation succeeded through careful forensic tracing and insurance record analysis rather than widespread panic. The case remains a clear illustration of how individual deception can intersect with broader consumer safety concerns.
Bibliography
Associated Press. (1988) ‘Woman convicted in cyanide murders’, The New York Times, 20 August.
Food and Drug Administration. (1986) Report on Excedrin cyanide contamination. Washington, DC: FDA.
Seattle Times staff. (1986–1988) Coverage of Auburn and Kent poisonings. The Seattle Times.
United States v. Nickell. (1988) United States District Court, Western District of Washington. Case No. CR88-123.
Douglas, J. and Olshaker, M. (1995) Obsession. New York: Scribner.
Rule, A. (2001) Empty Promises. New York: Pocket Books.
National Institutes of Justice. (1989) Product tampering investigations: lessons from the Nickell case. Washington, DC: NIJ.
Washington State Department of Health. (1986) Investigation summary: cyanide deaths in King County. Olympia: DOH.
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