The FBI and the 1951 Death of Mary Reeser in St. Petersburg

On the morning of Monday, July 2, 1951, a landlady in St. Petersburg, Florida, went to deliver a telegram to her tenant and found the apartment doorknob too hot to touch. Inside, Mary Hardy Reeser, a 67-year-old widow, had died in a fire that destroyed her and the armchair she had been sitting in, while most of the small room around her came through with little damage.¹ Soon afterward the city’s police chief had shipped the debris to the Federal Bureau of Investigation in Washington and asked its laboratory what could have happened.²

The case became, and has stayed, the standard American example of “spontaneous human combustion.” The FBI’s answer, though, was that nothing spontaneous had taken place. This article follows the investigation, the questions the Bureau did not settle, and the much older argument about burning bodies that the case was drawn into.

A quiet apartment on Cherry Street

Mrs. Reeser had moved to St. Petersburg from Columbia, Pennsylvania, in late 1950, a few years after the death of her husband, a physician. Her son, Dr. Richard Reeser Jr., practiced in the city, and she rented a studio unit in a group of four connected bungalow apartments at 1200 Cherry Street NE, a short walk from his house. Her landlady, Pansy Carpenter, lived in another unit of the same building.² Friends later told investigators that she was lonely and unhappy in Florida, and that a planned summer trip north had just fallen through.²

On the evening of Sunday, July 1, her son stopped by. According to the police detectives’ report as quoted by the journalist Bill DeYoung, he arrived about 8 p.m., found her in her nightgown, and was told she had taken two Seconal tablets and would take two more before going to bed. He stayed only a few minutes.² Seconal was a barbiturate prescribed for insomnia.

Around 5 a.m. Mrs. Carpenter thought she smelled smoke, decided it came from an overheating water pump in the garage, switched the pump off and went back to sleep. At 8 a.m. a Western Union messenger brought the telegram. When she found her tenant’s doorknob hot, she called to two house painters working across the street for help.²¹ The telegram, it turned out, was from a friend in the north confirming that lodging had been found for Mrs. Reeser’s summer visit after all.²

What the firemen and police found

The scene that made the case famous was the contrast between the fire’s intensity in one spot and its weakness elsewhere. Little was left of the chair but its coil springs, and the nearby end table and lamp were badly burned. Under the chair, the rug had burned in a circle about three feet across, and investigators noted a greasy residue on and around it.² Most of the remaining furniture showed no fire damage, according to the police report as quoted by DeYoung.²

The walls told the same story. A band of soot covered the upper part of the room, starting roughly four feet above the floor; fittings above that line had been damaged by heat while those below it were not. An electric clock had stopped at 4:20 and ran normally when plugged in elsewhere.¹² Jerry Blizin, who covered the story as a St. Petersburg Times reporter, recalled that a stack of newspapers beside the chair was not even scorched, and that hardly anyone had noticed smoke or an odor during the night.¹

Some details now repeated in books and on websites are less secure. Early newspaper coverage described a “shrunken” skull, and Blizin repeated that description in 2009. DeYoung, who quotes the police reports at length, writes that this detail does not appear in the police reports or in the FBI’s report and has never been confirmed.¹² It is best treated as part of the legend rather than part of the record.

Investigators ruled out lightning, found no fault in the apartment’s wiring and no gas leak in the kitchen.² That left them with a death they could not explain from their own experience. Police Chief Jacob R. Reichert wrote to the FBI, and the ashes and other material from the scene went to Washington along with photographs.²

The FBI Laboratory’s answer

The FBI Laboratory’s report was issued at the end of July and reached the St. Petersburg police in August 1951.²¹ The original document could not be consulted for this article, because the FBI’s online records library could not be reached when it was prepared. What follows rests on two published reproductions of the report’s wording, one by DeYoung and one by Blizin.

On the question of fuel, the laboratory found no trace of gasoline or other accelerants, while acknowledging that such substances could have been present and destroyed in the fire.² It did not think they were needed. In the passage DeYoung reproduces, the report states: “It is not generally realized to what extent the human body can burn once it becomes ignited.” It continues: “While such cases are not common, there are on record numerous instances of bodies burning with almost complete destruction.” It was “formerly believed,” the report adds, that such cases “arose from spontaneous combustion,” or the burning was attributed to “preternatural causes.”²

For the undamaged room, the Bureau offered a physical explanation: heat from the burning body rose and formed a layer of hot air that “never came in contact with the furnishings on a lower level,” a situation it thought especially likely if the fire had smoldered rather than burned freely.² Blizin’s version of the same sentence differs by a word or two, which suggests at least one reproduction is not exact.¹

As for ignition, Blizin summarizes the FBI’s view this way: Mrs. Reeser, sedated, fell asleep in the upholstered chair while smoking, and the cigarette set fire to her clothing; the chair burned too, although it had been treated to resist fire.¹ The report, as Blizin puts it, found no “spontaneous human combustion,” and ruled out lightning and chemicals.¹ Blizin’s own story laying out the FBI’s findings ran in the St. Petersburg Times on August 9, 1951, and the police department later handed out reprints to people who wrote asking about the case.¹

One small detail of that account is disputed by a witness. Blizin’s summary has the cigarette igniting a nightgown and a housecoat. Her son, interviewed by the Times in 1991, said that when he left she was wearing only a nightgown and was smoking a cigarette. He also said he accepted the FBI’s explanation: “I think the fire that consumed my mother’s body was so powerful because it fed on her own body fat.”²

The doubters, then and later

The FBI’s report did not satisfy everyone, and one of the doubters had real credentials. Wilton M. Krogman, a professor of physical anthropology at the University of Pennsylvania who said he had investigated more than 30 fire deaths, happened to be visiting Florida when the story broke and commented on the case. As Blizin quotes him, Krogman wrote: “I cannot conceive of such complete cremation without more burning of the apartment.”¹ He did agree with local funeral directors that cremating a body takes three or four hours at 2,500 to 3,000 degrees Fahrenheit.¹

Others were impressed by different things: the untouched newspapers, the absence of noticeable smoke, the clock. Blizin, who considered the FBI’s explanation “the most credible, if incomplete,” still listed these anomalies when he looked back at the case nearly sixty years later.¹ The two journalists describe the file’s status differently: Blizin wrote in 2009 that the case remained open at police headquarters, while DeYoung in 2025 calls it closed but technically unsolved.¹² Either way, the death was never formally explained, which has left room for every kind of theory.

It helps to separate two different claims. The FBI did not say it had reconstructed the night minute by minute; it said that an external flame, a smoldering fire and a large supply of body fat were enough to account for what was found, and that nothing in the record of similar cases required any other cause.² Krogman’s objection, as Blizin reports it, was to the degree of destruction and the lack of damage to the rest of the apartment. That disagreement, about how long and how hot a small fire can burn in one place, is the kind of question later researchers could test.

An older argument about burning bodies

The idea the FBI rejected was already old in 1951. Its most famous literary appearance came a century earlier, when Charles Dickens killed off the rag-and-bottle dealer Krook in Bleak House in an installment published in December 1852.³ The critic George Henry Lewes, who had studied physiology, objected in print. According to the science writer Sam Kean, Lewes accused Dickens “of giving currency to a vulgar error.”³

Dickens did not back down. In the preface to the completed novel, written in August 1853, he wrote that “before I wrote that description I took pains to investigate the subject,” and that “there are about thirty cases on record.” He singled out the 1731 death of the Countess Cornelia de Baudi Cesenate, described by Giuseppe Bianchini of Verona, and a case at Rheims recorded by the surgeon Le Cat in which a husband convicted of murdering his wife was acquitted on appeal.⁴ He closed with a challenge: he would not abandon the facts “until there shall have been a considerable spontaneous combustion of the testimony on which human occurrences are usually received.”⁴

The belief was not as foolish then as it sounds now. Chemists had linked breathing with combustion, and if the body burned its fuel slowly all the time, it seemed possible that the process could sometimes run out of control, especially in heavy drinkers. Lewes answered that the old reports were mostly secondhand, that the liver breaks down alcohol, and that a body made largely of water would not simply ignite.³ On that point he was right. The part of the old reports that survived was the pattern itself: a body heavily burned, the surroundings much less so, and no witness.

What later experiments showed

That pattern has since been studied directly. In a series of tests published in 2012, the forensic fire investigator John DeHaan exposed two unembalmed human cadavers to fires staged to resemble accidental ones: the bedding was lit with an open flame and the fires were left to burn out on their own. The bodies supported a modest fire for some six to seven hours. Where a material was present that could act as a wick for melted body fat, the torso was extensively destroyed while the head and limbs were damaged much less. By contrast, when a partial cadaver was exposed to a short, fast fire that engulfed a furnished room, lasting about 15 minutes in all, the torso suffered only surface damage.⁵

Those findings line up closely with what puzzled investigators in St. Petersburg: a small, long, low fire, fed mostly by the body itself and concentrated in one place, rather than a fast blaze that spreads through a room. A 2012 review led by a plastic surgeon at the University of Helsinki, examining a dozen such cases reported since 2000, described the same sequence. Once a person has died in a flame burn, melted fat can soak into charred clothing and act like a candle wick, producing localized heat for a long period. Because these deaths usually happen with no one present, the authors note, they were once put down to supernatural causes. They proposed dropping the old name altogether in favor of a plainer one, “fat wick burns.”⁶

None of this can tell us exactly what happened to Mary Reeser in the early hours of July 2, 1951. The FBI worked from ashes and photographs, this account of its report rests on published quotation, and some of the most striking details in later retellings have no documentary basis. But the Bureau’s central conclusion has held up well. Her death was a tragedy of a familiar kind: a person alone, a source of flame, and a fire that burned slowly enough, and long enough, that no one understood what was happening until morning.

Footnotes

1. Blizin, “Mystery lingers,” Tampa Bay Times, 2009. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴

2. DeYoung, “Vintage St. Pete: The strange case of Mary Reeser,” St Pete Catalyst, 2025, quoting the police and FBI reports. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹

3. Kean, Popular Science, 2017 (excerpt from Caesar’s Last Breath). ↩ ↩² ↩³

4. Dickens, Bleak House, Preface (1853). ↩ ↩²

5. DeHaan 2012, abstract. ↩

6. Koljonen and Kluger 2012, abstract. ↩