Riverside, California, February 19, 1994.
An ambulance arrives at the emergency room with 31-year-old Gloria Ramirez—a mother of two, a perpetually smiling volunteer at the local parish. That evening, however, she is barely able to breathe, her pulse is racing, and her blood pressure drops to critical levels. Fifty minutes later, the patient is pronounced dead—and six people who tried to resuscitate her end up with convulsions, fainting spells, or temporary paralysis. It was this incident that earned Ramirez the media-given nickname “the Toxic Lady.”
A dramatic resuscitation with strange phenomena
The doctors followed the manual: intravenous lidocaine, codeine for pain relief, Tigan for nausea, and several in-hospital defibrillator shocks. But within the first minutes, nurses noticed a greasy film on the patient’s skin, and a sharp fruity-garlicky odor coming from her mouth. When drawing blood, they saw small brownish crystals in the syringe, and everyone was struck by a piercing ammonia smell—something they had never encountered elsewhere in the ER.
As the team tried to stabilize her vital signs, one nurse suddenly collapsed, another began hyperventilating, and a third—after fainting—couldn’t move her limbs. In total, six staff members developed symptoms ranging from severe nausea to muscle spasms.
Safety protocol and three autopsies
Immediately after death was declared, the unit was sealed off, specialists in full-body protective gear were called in, and the body was placed in an aluminum casket sealed with wax. The first autopsy took place after six days; the second—significantly more thorough—did not happen until six weeks later, in a ventilated negative-pressure chamber. Even then, there was no clear answer: no poisonous gas, nerve toxins, or laboratory chemicals were found in the surrounding environment.
Toxicologists did, however, find unusually high levels of dimethyl sulfone (DMSO₂) in her blood and tissues. This substance is formed by oxidation of the well-known solvent DMSO (dimethyl sulfoxide). Its natural half-life in the human body is three days, yet even six weeks after death, the amount was triple the normal level. In addition, traces of common medications (Tylenol, lidocaine, codeine, Tigan) were found, whose metabolites may have contributed to the ammonia-like odor.
The rise of a popular but dangerous form of “self-treatment”
In the 1960s, DMSO appeared in creams for joint pain and sports injuries, until the FDA pointed to risks of vision damage and cellular toxicity. By the time of Ramirez’s death, concentrated 99% DMSO could be obtained only at hardware stores as an industrial degreaser—yet on alternative-medicine forums it was still being promoted as a “cure-all.” Investigators believe Gloria applied it to her skin to ease unbearable pain in the terminal stage of cervical cancer, diagnosed just six weeks before her death.
In the enclosed ER environment, however, it could evaporate from her skin and, when exposed to oxygen and the electrical discharges of the defibrillator, oxidize into dimethyl sulfate (DMSO₄)—a highly aggressive gas that destroys cells in the eyes, lungs, and mucous membranes. Nineteen of the twenty reported symptoms among staff closely match the clinical picture of poisoning by this compound.
The rejected “mass hysteria” theory
The county health department initially explained the incident as “mass sociogenic illness”—essentially stress and suggestion triggered by the unusual smell. Staff, however, argued that professional training and protective masks prepared them for such situations, and that the collapses were not psychological but toxic in origin. To this day, the chemical pathway DMSO → DMSO₂ → DMSO₄ has not been reproduced in the lab with 100% certainty, but forensic circles consider it the most likely scenario.
Case impact and questions that remain open
- Degreaser safety – after the case, the U.S. EPA tightened labeling requirements for products containing DMSO and recommended limiting package sizes.
- Patient education – oncology centers in California introduced mandatory consultations about the risks of “at-home chemotherapy” via supplements bought online.
- Family dispute – Gloria’s relatives still reject the claim that she used DMSO; they point to hospital protocols left unmet in previous inspections.
The case remains a cautionary tale—both a reminder of the desperation that can drive a seriously ill person to unverified methods, and a warning that even a seemingly harmless “alternative” can cause catastrophe in a critical setting.
Toxic Lady video
Sources and further reading
- Centers for Disease Control and Prevention. “Unexplained Illness and Death — California.” MMWR 1994. — https://www.cdc.gov/mmwr/preview/mmwrhtml/00027809.htm
- Grant, R. “The Toxic Lady of Riverside.” Emerging Infectious Diseases 1997. — https://pubmed.ncbi.nlm.nih.gov/7810126/
- Clark, R. “Chemical Mystery in the ER: Revisiting the Gloria Ramirez Case.” Journal of Toxicology 2004. — https://www.sciencedirect.com/science/article/abs/pii/0165614794001004
Robert
I’m interested in technology and history, especially true crime stories. For three years I ran a fact-based portal about modern history, and for a year I co-built a blogging platform where I published dozens of analytical articles. I founded offpitch so that quality content wouldn’t be hidden behind a paywall.
