The Story Of Serial Killer Edmund Kemper, Whose Story Is Almost Too Gross To Be Real

At a young age, Kemper decapitated his sisters' dolls and even stalked his second-grade teacher with a bayonet.

Edmund Kemper

Wikimedia CommonsEdmund Kemper, “The Co-Ed Killer.”

Though recently revisited in the Netflix series Mindhunters, one of the most heinous, but most overlooked serial killers of American history is “The Co-ed Killer,” Edmund Kemper III.

At 6 feet 9 inches and with an IQ of 145, Edmund Kemper was an intimidating killer in every sense of the word.

Kemper’s murderous impulses can be traced back to his childhood, where he presented troubling behavior in a family ill-equipped to deal with his problems. His father, Edmund Emil Kemper II, was a World War II veteran who was in a loveless and damaging marriage with his mother, Clarnell Elizabeth Kemper.

Clarnell was an alcoholic, possibly suffering from borderline personality disorder. The older Kemper, who had worked on nuclear bomb tests in the Pacific once said that “suicide missions in wartime and the later atomic bomb testings were nothing compared to living with Clarnell.”

Clarnell would berate her husband for what she perceived as his “menial” job, and refused to coddle her son for fear that it would “turn him gay.”

At the same time, Kemper began to display dark fantasies relating to sexuality and death. He would decapitate his sister’s dolls in elaborate rites and even stalked his second-grade teacher outside her house, carrying his father’s bayonet.

At the age of 10, he killed his family’s pet cat, and at the age of 13, he killed another, this time keeping pieces of the animal in his closet until his mother found them.

In 1957, Kemper’s father left the family, leaving him in the company of just his mother and two sisters. His mother feared Kemper, who already stood 6’4″ at the age of 15, and made him sleep in a locked basement for fear that he would harm his sisters.

She would regularly berate and insult him, telling the boy that no woman would ever love him.

At the age of 14, Kemper ran away from his mother’s house to live with his father in California.

However, his father had remarried and sent Kemper to live with his grandparents on their ranch. There Kemper transferred much of his rage towards his parents towards these new stewards of his.

Grandparents Kemper

Personal photoEdmund Emil Kemper and Maude Matilda Hughey Kemper.

After getting into an argument with his grandmother, Kemper shot her in the head with his grandfather’s .22 caliber rifle.

He then killed his grandfather as he was walking up the driveway towards the house so, according to Kemper, he would not have to find out his wife was dead.

Kemper then turned himself into the police after calling his mother and asking what to do.

Kemper was then sent to the criminally insane unit of Atascadero State Hospital. It was there that he was first tested for his IQ, and learned of his high score.

On Kemper’s 21st birthday in 1969, he was finally released from Atascadero back into the care of his mother, who was now working as an administrative assistant at the University of California, Santa Cruz.

He still had to check in with probation psychologists, but knew what to say to them from his experiences at Atascadero and was considered a low risk.

After a year, Kemper began living in places across Northern California, periodically returning to his mother’s house in Aptos when he had run out of money.

It was at this time that Kemper embarked on his infamous murder spree where he would pick up young women who were hitchhiking and murder them, have sex with their corpses, and dismember their bodies.

His first victims were Mary Ann Pesce and Anita Luchessa, two Fresno State students he encountered while driving around Berkley, Calif. Kemper brought the women to a wooded area nearby where he originally intended to rape them, but panicked and ended up stabbing and choking the two women to death.

He then stuffed their bodies in his trunk and drove over to his house in Alameda where he was living at the time. On the way, a police officer stopped him for a broken taillight but did not search the car.

Once home, Kemper raped the bodies, before dismembering them, placing the pieces of the bodies in plastic bags, and disposing of them in a ravine near Loma Prieta Mountain.

Kemper continued this formula of murder on his next victim, 15-year-old Korean dance student Aiko Koo. During this encounter, Kemper accidentally locked himself out of his car but was able to persuade Koo to let him back in.

Aiko Koo

Bettmann/Getty ImagesAiko Koo, 15. Victim of Ed Kemper.

By early 1973, Kemper had run out of funds and had moved back in with his mother at her home on the UC Santa Cruz campus. There he continued his killings, murdering three more college students he picked up around the campus.

He even buried one of the dismembered heads of his victims in his mother’s garden and left it facing upward toward her bedroom. According to him, he did this because his mother “always wanted people to look up to her.”

Then, on April 20, 1973, Kemper’s murders reached their natural culmination when he bludgeoned his mother to death with a claw hammer while she slept in her bed. Kemper then decapitated her and raped her severed head, before placing it on a shelf and using it as a dart board.

He cut out her tongue and larynx and placed them in the garbage disposal.

Kemper then invited his mother’s best friend over to the house, before murdering her and stealing her car. He drove to Colorado, but after not hearing any news of the murders, ended up calling the police from a phone booth to confess to murdering his mother.

The police did not take the call seriously prompting Kemper to admit to all of the murders he had committed to get their attention. When asked why he turned himself in, Kemper said that “the original purpose was gone…I just said to hell with it and called it all off.”

He was arrested and convicted of eight counts of first-degree murder. Kemper attempted suicide twice, and even requested the death penalty, but failed on all counts and was given seven consecutive life sentences.

Kemper Walking

Bettmann/Getty ImagesEdmund Kemper is escorted into Judge Donald May’s court by police.

Edmund Kemper was imprisoned at the California Medical Facility alongside Herbert Mullin and Charles Manson, where he still resides to this day. While in prison, Kemper willingly participated in a number of interviews from reporters and law enforcement.

As detailed in Mindhunters, Edmund Kemper’s testimony as to his state of mind during his murders was integral to law enforcement’s understanding of the mind of serial killers.

Edmund Kemper became a model prisoner at the California Medical Facility, where he is in charge of scheduling other inmates’ appointments with psychiatrists and has spent over 5,000 hours narrating books on tape for the blind.


Now that you’ve read about Edmund Kemper, learn the sad, gruesome story of the most cold-blooded serial killer in history, Carl Panzram. Then, learn the true stories of the characters behind Mindhunter.

Gabe Paoletti
Gabe is a New York City-based writer and an Editorial Intern at All That Is Interesting.
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