Stella Nickell used cyanide to murder her husband and a complete stranger in Washington state in 1986, staging the deaths as random product tampering to collect insurance payouts.
Stella Nickell planned the killings with careful attention to detail. She purchased cyanide from a local supplier and introduced it into Excedrin capsules. The scheme required additional tampering of store shelves to create the appearance of a wider threat. Two people died as a direct result. The case drew attention because it exploited public fears that had emerged after the 1982 Chicago Tylenol incidents.
Background
Stella Nickell grew up in the Pacific Northwest. She married Bruce Nickell in 1974 after previous relationships. The couple lived in Auburn, Washington, where Bruce worked in a local mill. Stella held various jobs, including work at a local plant. Their marriage lasted twelve years and produced no children together, though Stella had a daughter from an earlier partnership.
Financial pressures existed within the household. Bruce carried life insurance policies that named Stella as beneficiary. Policy documents later showed combined coverage exceeding one hundred thousand dollars. Stella also maintained her own policies on Bruce. Court records indicate she had inquired about payout amounts in the months before his death.
The Crimes
Bruce Nickell collapsed at home on 5 June 1986. He died shortly after arrival at a local hospital. Initial medical examination attributed death to emphysema. No immediate suspicion of foul play arose.
Eleven days later, Sue Snow, a bank manager, ingested cyanide from an Excedrin capsule in her home in Kent, Washington. She died en route to hospital. Autopsy results confirmed cyanide poisoning. Investigators traced the capsule to a bottle purchased at a local store. The discovery prompted a wider recall and testing of Excedrin products across the region.
Additional Tampering
Further bottles containing cyanide appeared on store shelves in the same area. Four additional contaminated containers were recovered. None caused further deaths. The pattern suggested deliberate placement rather than manufacturing error. Federal agencies joined the inquiry because the case involved interstate commerce and product safety.
Investigation
The Food and Drug Administration and local police coordinated the response. Laboratory analysis confirmed potassium cyanide in the capsules. Investigators examined purchase records and interviewed pharmacy staff. Stella Nickell came forward early, claiming she had purchased Excedrin for her husband shortly before his death. She provided a bottle that tested positive for cyanide.
Detectives noticed inconsistencies in her account. Pharmacy receipts showed she had bought multiple bottles within a short period. Stella also contacted authorities repeatedly with suggestions about possible suspects. These contacts raised questions about her level of involvement.
Key Evidence
Forensic examination of the cyanide revealed trace particles of a specific green dye used in aquarium products. Records showed Stella had purchased a cyanide-based fish treatment containing the same dye. Handwriting analysis linked her to notes on product complaint forms. Fingerprint evidence placed her in proximity to the tampered bottles.
Insurance documents formed another strand. Stella filed claims on Bruce’s policies within weeks of his death. She had increased coverage on him in the preceding year. Bank records indicated financial strain that aligned with the timing of the policy adjustments.
Capture and Arrest
Authorities arrested Stella Nickell on 9 December 1987. She faced state charges of murder and federal charges of product tampering. During interviews she maintained that an unknown person had contaminated the products. Prosecutors presented evidence that she alone had access to both the cyanide source and the insurance benefits.
Trial
The federal trial opened in Seattle in 1988. Prosecutors relied on circumstantial evidence because no witness observed the tampering. The combination of chemical traces, handwriting, insurance motives and behavioural patterns proved decisive. The jury convicted Stella Nickell on two counts of murder and five counts of product tampering.
She received a ninety-year federal sentence. State charges were not pursued further once the federal term was imposed. Appeals upheld the conviction. Stella Nickell remains incarcerated at a federal facility.
Psychological Profile
Court-appointed evaluations described Stella Nickell as methodical and focused on financial gain. No evidence of broader psychosis emerged. The crimes required planning, acquisition of a restricted substance and repeated actions to stage the scene. These elements pointed to calculated rather than impulsive behaviour.
Legacy and Legal Impact
The case reinforced federal authority over product tampering. It marked the first successful prosecution under statutes enacted after the Tylenol murders. Manufacturers strengthened tamper-evident packaging across over-the-counter medicines. Public health agencies refined rapid-response protocols for suspected contamination events.
Victims’ families received limited compensation through insurance and civil settlements. The deaths of Bruce Nickell and Sue Snow left lasting effects on their relatives. No further victims have been linked to the same series of acts.
Conclusion
Stella Nickell’s offences combined poison, deception and financial motive. The investigation relied on forensic links between cyanide source, contaminated products and insurance records. Conviction followed from the accumulation of physical and documentary evidence rather than direct eyewitness testimony. The case remains a clear example of how product tampering statutes address deliberate harm to the public supply chain.
Bibliography
Associated Press. (1988) ‘Woman convicted in Excedrin poisonings’, The New York Times, 10 December.
Department of Justice. (1988) United States v. Stella Nickell. Seattle: United States District Court.
Food and Drug Administration. (1986) Report on Cyanide Contamination in Excedrin Products. Washington: FDA.
McCarthy, T. (2004) Poisoned Profits: The Stella Nickell Case. New York: St. Martin’s Press.
Seattle Times Staff. (1987) ‘Auburn woman charged in cyanide deaths’, The Seattle Times, 10 December.
Washington State Patrol. (1986) Autopsy and Toxicology Reports: Bruce Nickell and Sue Snow. Olympia: Washington State Patrol Crime Laboratory.
York, M. (1990) ‘Product tampering prosecutions after the Nickell case’, Journal of Criminal Law and Criminology, 81(2), pp. 345–367.
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