John George Haigh or the Acid Bath Murderer was a monstrous English serial killer in the 1940s

Brad Smithfield
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John George Haigh proved himself a very intelligent student with a passion for classical music. As a youth from Stamford, Lincolnshire, winning scholarships for Wakefield Grammar School and Wakefield Cathedral showed promising results and a good future for the young man.

But this was not the case. His very conservative parents and strict upbringing completely threw the boy off-course, setting in motion a cunning killing machine who will be forever remembered as the Acid Bath Murderer.

Haigh was convicted of brutally murdering six people, while he himself claimed he had killed nine. The serial killer started out as a petty thief, with biblical delusions that he was unpunishable by the authorities.

John George Haigh (24 July 1909 – 10 August 1949), The Acid Bath Murderer Photo Credit


Haigh’s parents were in a highly conservative sect, the Plymouth Brethren. The parents went with extreme measures like confining the young man to the house within 3 meter walls, never letting him go outside, and forbidding him to play with toys, as it was regarded “sinful”.Photo Credit

What makes his case bizarre is that he used vats full of sulphuric acid to “clean-up” his crimes. After killing his victims, he robbed them of valuable possessions before dumping the bodies in a vat full of acid. After two days, the bodies turned to organic sludge, which made it easier for him to pour the remains into the sewer.

He learned this gruesome method from experimenting with mice. The rodent’s bodies only needed 30 minutes to completely dissolve in the highly acidic substance.

The police records and evidence claim that Haigh was cunning, but not witty. He learned about the corpus delicti law terminology, which claimed that “a crime must be proved to have occurred before a person can be convicted of committing that crime.” He thought that “in the absence of a body of evidence, murder could not be proven”.

Police photograph of John Haigh, The Acid Bath Murderer (1949)


Constance Lane, a friend of the wealthy widow Olive Durand-Deacon, Haigh’s last unfortunate victim, alerted the police that her friend was missing and sparked the investigation which would imprison him. Apparently, the killer was an acquaintance of Durand-Deacon. He lied to her about being an engineer and said he would meet her in order to discuss an idea for artificial fingernails.


Panoramic photograph of Wandsworth Prison, where Haigh was imprisoned and hanged. The prison had boasted famous criminals like George Chapman (believed to be the infamous Jack the Ripper), Oscar Wilde, British fascist John Amery, Julian Assange, and Charles Salvador, Britain’s most feared criminal who has never actually murdered anyone. Photo Credit

Haigh shot Durand-Deacon with his .38 caliber Webley revolver in the back of her head, took her valuables, and proceeded to dump the body in a vat. Detectives inquired about his theft and fraud record, which raised suspicion and decided to search his workshop where the vats were. They managed to find a dry cleaner’s receipt for Mrs. Durand-Deacon’s coat, which led to Haigh’s capture.

Further investigating the workshop, famous pathologist Keith Simpson discovered gallstones and teeth in the sulphuric acid vats, where Mrs. Durand-Deacon’s dentist recognized them as hers.

Cedric Keith Simpson (20 July 1907 – 21 July 1985), Professor of Forensic Medicine in the University of London. Pioneer of forensic dentistry, no doubt an acquired experience from Haigh’s case. Photo Credit

After failing to plead insanity, John George Haigh was hanged in Wandsworth Prison by executioner Albert Pierrepoint on 10 August 1949. The judge needed only minutes to declare him guilty.

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The delusional killer literally took the phrase “body of evidence” as a corpse, completely misinterpreting the figurative terminology. This is why he was fond of the grisly method of dissolving the bodies in acid. Once thinking that his acid vat plans were foolproof, this later resulted in his capture and execution.