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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Massachusetts authorities reported that fitness influencer and bodybuilder Hayley McNeff died from acute intoxication due to the combined effects of heroin, fentanyl, 4-ANPP, cocaine and norbuprenorphine. The state classified her death as accidental. The finding was reported publicly in November 2025.
What was Hayley McNeff’s cause of death?
Brenna Galvin, communications director for the Massachusetts Executive Office of Public Safety and Security, told Us Weekly that the cause was acute intoxication due to the combined effects of heroin, fentanyl, 4-ANPP, cocaine and norbuprenorphine. The state classified the manner of death as accidental.
This is an attributed account of the state finding. The medical examiner’s report, death certificate and toxicology document were not available for independent review in the reporting cited here, so further details about the circumstances or toxicology should not be inferred.
When was the finding made public?
McNeff died on August 8, 2025. On August 15, an article from Men’s Fitness said the cause had not been publicly shared at that time. That was the status then, not the later conclusion: reports on November 10 and 11 attributed the cause and accidental manner to the Massachusetts Executive Office of Public Safety and Security.
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Who was Hayley McNeff?
McNeff was 37 and was described in coverage as a bodybuilder and fitness influencer. Her Boston.com obituary also recounted a wider athletic background and later graduate studies in psychology. Those biographical details provide context about her life; they do not explain the reported cause of death.
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