"Cause of death: Multiple fractures of the skull and face, with lacerations of the brain and hemorrhage, and fracture dislocation of the cervical spine."
The Mansfield bar is one of the most significant safety innovations in trucking history, and it stands as an unintended but powerful memorial to the actress. It is a direct legacy of the detailed accident investigation, serving as a silent guardian on highways across the world, preventing the same type of "underride" accident that claimed her life.
Following the accident, Mansfield’s body was taken for examination in New Orleans. The official autopsy and the subsequent death certificate provide the single most reliable source of information about the exact cause of her death.
Obtain contemporary newspaper accounts (best starting point)
At approximately 2:25 AM, on a misty stretch of U.S. Highway 90 near Slidell, Louisiana, the Buick rounded a curve and crashed at high speed into the rear of a tractor-trailer. The truck had slowed down behind a city vehicle spraying mosquito fog, which severely obscured visibility on the road.
The autopsy revealed that Mansfield suffered from a pre-existing condition, a congenital abnormality of the cervical spine, which may have contributed to her increased susceptibility to neck injuries.
This clinical language, while distinguishing the injury from a true beheading, confirms that her death was instantaneous from a massive, virtually unsurvivable head injury.
The rumor that Mansfield was decapitated began after police photographs of the scene circulated. These photos showed what appeared to be her blonde hair in the smashed windshield of the 1966 Buick Electra.
Just after 2:25 AM on June 29, 1967, a 1966 Buick Electra slammed into the rear of a tractor-trailer on a dark, foggy stretch of U.S. Route 90, just outside of New Orleans. Inside the car was one of the most recognizable blonde bombshells of the 1950s and 60s: Jayne Mansfield. The 34-year-old actress, known for her voluptuous figure, platinum hair, and publicity stunts, was killed instantly along with her boyfriend, attorney Sam Brody, and their driver, Ronald B. Harrison.
Before analyzing the autopsy, it is crucial to address the elephant in the room: the decapitation myth. The rumor began almost immediately after the crash. Witnesses claimed that the top of the Buick was sheared off, and that Mansfield’s head was severed by the impact with the rear of the trailer.
The internal examination revealed significant injuries to Mansfield's thoracic and abdominal cavities. Her heart, lungs, and liver were found to be severely damaged, with evidence of massive bleeding in the thoracic cavity. The report also noted that Mansfield had suffered a severe fracture of the steering wheel, which had been driven into her chest.
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The Buick crashed directly into the rear of the tractor-trailer. Because the trailer sat high off the ground, the hood of the Buick slid underneath it, a horrific phenomenon known as "underride." The force of the impact sheared off the top of the car.
The three adults in the front seat—Mansfield, Brody, and Harrison—were killed instantly. Miraculously, the three children sleeping in the back seat survived with minor injuries. The Autopsy Report and the Decapitation Myth