Serial killer Charles Manson confessed to other murders in a recently released prison phone call, but a forensic psychologist told Fox News Digital his claims should be met with some skepticism.

“There’s a whole part of my life that no one knows about,” Manson said during the phone call, shown in a short clip from Peacock’s upcoming documentary series, “Making Manson.”

“I lived in Mexico for a while. I went to Acapulco, I stole cars,” continued Manson, who died at age 83 in November 2017. “I just got involved in some stuff that “I’ve been involved in a few murders. I left my .357 Magnum in Mexico and left some dead people on the beach.”

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Charles Manson was convicted of one count of murder and several counts of attempted murder. He was the leader of the Manson Family, a cult that committed several murders at Manson’s behest. (AP/Ron Galella)

The documentary, premiering Tuesday, delves into more than two decades of never-before-seen conversations with the cult’s notorious figurehead, offering a deeper look at his childhood and criminal life before forming the “Manson Family” and during his mandate. a sect leader.

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The documentary also features interviews with family members and people who knew him personally, as well as his persistent violent behavior behind bars, where he assaulted several guards, started fires in his cell and caused general chaos.

“Charlie was very good at being mean and not showing it,” Phil Kaufman, Manson’s former cellmate, said on the show. “Anything that distracted him from his game plan at that point, he squashed it, but he did it with kid gloves.”

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A photo of Charles Manson from August 14, 2017, a month before he died of natural causes behind bars at age 83. (California Department of Corrections and Rehabilitation shows Charles Manson)

Manson spent more than 45 years in prison after being convicted of leading his “Manson Family” — a struggling clan of mostly women he gathered through his charisma and hallucinogenic drugs — to kill at least seven people in California during the summer of 1969. Among the dead was director Roman Polanski’s pregnant wife, Sharon Tate, who was stabbed 16 times.

Manson did not directly commit the murders. Instead, he used psychological manipulation to incite his followers to kill as part of his “Helter Skelter” plot, which he claimed would start a race war.

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Forensic psychologist Kris Mohandie told Fox News Digital that he wouldn’t be surprised if Manson committed murders in addition to those he was convicted of – but that conversely, his claims cannot be entirely trusted .

“It’s not surprising at all,” Mohandie said. “He was a psychopath, and you know, really involved in a whole host of different criminal behaviors and violence and pushing his followers to do violence. That wouldn’t surprise me at all, given his history and what we know that he was a psychopath.

“He’s very comfortable manipulating people, hurting people, dominating people and taking advantage of people… it wouldn’t surprise me if there were other murders that he was responsible for, historically.”

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Seven deputies escort Charles Manson from the courtroom after he and three supporters were convicted of seven murders in the Tate-LaBianca murders. (Bettmann/Getty Images)

“Most people who have been convicted of multiple murders, like serial killers and such, (everyone says), ‘This person killed so many people,’ but really you only know what they did for. were arrested,” he continued.

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However, Mohandie explained, Manson was a “liar and attention seeker.”

“A person like him also lies and he is extraordinarily manipulative. The truth of what it really was will never be known,” Mohandie said. “A psychopath like him lies if there is something to gain, for things as simple as getting attention or shocking people – it becomes a complex variable in getting to the truth. We will never know what that it was – people like him, and especially him, lie, deceive and manipulate for all kinds of motivations.

Criminology expert James Pipe said the new revelations are “a stark reminder of the long-term consequences of Manson’s actions and the importance of remaining vigilant in the search for truth, no matter how much time has passed.” elapsed”.

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“Manson’s admission to other murders fundamentally changes what we thought we knew about his criminal history,” Pipe told Fox News Digital. “If these claims are proven, they highlight a broader pattern of violence that extends beyond his notorious crimes in the United States. Law enforcement must thoroughly investigate these allegations, particularly regarding unresolved cases in Mexico, to ensure that all possible victims obtain justice.