The impact caused a partial evisceration of the cranium and brain matter. In medical terms, she suffered an "avulsion" of the cranium—meaning a significant portion of her skull and scalp was torn away by the sheer force of the metal trailer slicing through the car. While her head injuries were catastrophic and caused instantaneous death, her head remained attached to her body. Additional Injuries
. The rumors originated from a photo of her blonde hair on the car's windshield, which was actually a wig that had been thrown from her head during the crash. Official Cause of Death:
The group was driving to New Orleans, where Mansfield was scheduled to appear on a television show after a performance at the Gus Stevens Dinner Club in Biloxi, Mississippi.
The Jayne Mansfield autopsy report serves a dual purpose. Legally, it records the cause of death: "Crushed chest and transection of spinal cord due to auto accident." Medically, it confirms the brutal physics of a high-speed underride collision. And historically, it acts as a corrective to one of Hollywood’s most enduring horror stories.
The official report listed the following key injuries:
Multiple deep lacerations on her hands and lower extremities. Status at Scene
Contrary to the persistent myth, the autopsy report explicitly states that However, the injuries were so severe that the rumor’s origin is understandable.
Crushed skull with avulsion of the brain.
While the specifics of her death are morbidly fascinating, they must also be viewed in the context of her life. Far from the "dumb blonde" persona she often portrayed, Mansfield was an intelligent woman who spoke five languages and was a talented violinist and pianist. She was also a devoted mother who fought for custody of her children.
The National Highway Traffic Safety Administration (NHTSA) recognized that the primary reason for the three fatalities was the lack of an underride guard on the back of the tractor-trailer. Because the trailer sat so high off the ground, the passenger car slid right underneath it, bypassing the car's bumper and crumple zones.
The gruesome nature of the accident sparked intense speculation, which was further amplified by Mansfield's association with Anton LaVey, the founder of the Church of Satan. Mansfield had met LaVey in 1966, and the media frequently capitalized on their friendship, branding her a "High Priestess" of the church.
The injuries were a result of the car's roof being sheared off as it went under the trailer, causing severe,, upper-level trauma to all occupants in the front seat. The Aftermath and Legacy
While the three adults in the front seat died instantly, Mansfield’s three children, including Mariska Hargitay
Approximately 2:25 a.m., on U.S. Route 90 just outside Slidell, Louisiana, the car slammed into the rear of a tractor-trailer. The truck had slowed down due to a mosquito fogging machine spraying a dense white cloud across the highway. The Buick went underneath the truck's rear bumper.