Cult leader and notorious criminal Charles Manson once made a chilling admission during a prison phone call, that has now been revealed.
The audio has come to the fore as part of a teaser clip for an upcoming Peacock docuseries named Making Manson, featuring a number of the American convict's previously unheard phone calls over the course of 20 years.
Manson appeared to confess to doing more than was initially thought after he was imprisoned for a number of murders in the late 60s and early 70s, adding that 'there's a whole part of my life that nobody knows'.
He is known for leading the crime-ridden 'Manson family' cult that killed at least nine people, though he did not murder anyone himself, it's said he made his followers do them on his behalf.
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Manson rose to notoriety for orchestrating the brutal murder of actor Sharon Tate, 26, in 1969.
After being arrested the following year, he appeared at the trial with a swastika carved into his head and was given the death sentence, which was changed to nine consecutive life sentences after California abolished the death penalty.
He would then die in jail in 2017, after over 40 years behind bars, aged 83.
Making Manson looks at Manson's life before he started his cult, which consisted mostly of young women, and the crimes he was originally convicted for.
Manson had been imprisoned two times in the 50s and 60s, including arrests for rape and theft.
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In the teaser for the documentary, a chilling audio recording reveals the moment Manson appears to admits to previously unknown killings.
"See there's a whole part of my life that nobody knows," Manson said in a prison phone call.
"I lived in Mexico for a while. I went to Acapulco, stole some cars. I just got involved in stuff over my head, man. Got involved in a couple of killings.
"I left my .357 Magnum in Mexico City, and I left some dead people on the beach."
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After being sent away to prison, he nightmarishly stated: "Maybe I should have killed 500 people, I would have felt I really offered society something."
One of Manson's former cellmates, Phil Kaufman, shared what it was like to live with the cult leader.
In the teaser, Kaufman said: "Charlie was very good at be being evil and not not showing it.
"Anything that detracted him from his game plan at that time, he would squash it, but he did it with velvet gloves."
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Many of his associates and 'family' members didn't think much about his criminal record that was accrued in the 50s and early 60s, as music producer Gregg Jakobson admitted: "I was told he had gotten out of jail or prison or whatever - I never knew the details, and that didn't mean much in the 60s."
However, he did add: "But if we knew that he had murdered somebody, that would be different. But he just had gotten out of jail, that's all we knew."
Making Manson will be available to stream on Peacock on 19 November.
Joshua Nair