JEFFREY Epstein's "overly self-confident nature" has made a lawyer who represented his victims doubt whether he took his own life.
The paedo financier, 66, was found dead in his cell in 2019 as he awaited trial.
But lawyer Spencer Kuvin, who met Epstein several times, said the shamed billionaire never thought he had done anything wrong - and arrogantly believed he wouldn't be jailed.
He told The Sun: "From the times I met him and deposed him, and sat in mediations with him, he never, ever struck me as someone who questioned whether he had done anything wrong.
"He was always overly self-confident in what he had done and his belief that he had never done anything inappropriate at all, ever.
"There was never any inclination that he ever felt he wasn't going to get out.
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"He always felt 'this is something I got to go through, I'll be out of here in a flash, it's not a big deal'.
"So it was rather surprising to me when he died in jail."
When asked whether he thought Epstein was murdered, Mr Kuvin said: "I don't know. I'm not one for wild speculation.
"I deal in reality and proof and evidence.
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"And what I could tell you is that the evidence is circumstantial but overwhelming that it was not suicide."
Depraved Epstein was found unresponsive by guards early on August 10, 2019, by guards in his cell at the Metropolitan Correctional Center in New York City.
They performed CPR before he was taken to hospital, where he was pronounced dead.
Epstein's death was ruled as suicide by hanging - which was challenged by his own lawyers.
The jail had been told Epstein should have a cellmate, and that a guard must check on him every 30 minutes.
But on the night he died, his cellmate was transferred and not replaced and he was not checked on as often as required.
Two guards fell asleep at their desks - and later falsified their records.
Meanwhile, two cameras in front of Epstein's cell malfunctioned that night - while another's footage was "unusable".
Protocol was also broken by removing Epstein's body from his call and failing to photograph it as it was found.
The Bureau of Prisons mandates that suicide scenes be treated with the "same level of protection as any crime scene in which a death has occurred".
Epstein's death came just two weeks after another apparent suicide attempt when he was found unconscious with a bedsheet twisted round his bruised neck.
Mr Kuvin believes this catalogue of "mistakes" coupled with Epstein's personality could suggest Epstein didn't take his own life.
The lawyer, who represented three of Epstein's victims, told how the paedo had an "overly confident" nature - and brazenly believed he had done nothing wrong.
Mr Kuvin, who sat down for several mediation sessions with Epstein, said his mood would just "flip".
He said: "He was overly confident. He was engaging, friendly and disarming - until he was upset, at which point it was like a switch flipped.
"He always thought he was the smartest one in the room, you could tell by how he spoke to people.
"If they challenged him or questioned him, he made them feel like they were stupid.
"Whenever I saw him, knowing I was his adversary, he would still try and engage in casual conversation and try to be friendly.
"Then if I got adversarial with him, you could tell that there was a switch that would flip.
"He would try to make you feel like you didn't know what you were talking about and were stupid."
Top pathologist Dr Michael Baden previously told how he believed a "tell-tale sign" indicted Epstein was murdered.
Dr Baden, New York City’s former chief medical examiner, said he believes the paedo was most likely strangled - and "a number of people would have to be involved".
He was overly confident. He was engaging, friendly and disarming - until he was upset, at which point it was like a switch flipped
Spencer Kuvin
He suspected foul play after being hired by Epstein’s family to observe his autopsy.
Dr Baden said there were worrying signs “from day one” of the autopsy claiming the bone injuries found were more indicative of homicide strangulation.
He added: "Hanging does not cause these broken bones. Homicide does."
During his autopsy, Epstein was found to have broken his hyoid bone.
Although hyoid breaks can occur during a hanging, experts say the fracture is more common in strangulation victims.
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It comes as bombshell court documents revealed new details about Prince Andrew's friendship with Epstein - and contradict the royal's claims.
Andrew told Epstein they should "play some more soon!" in an email - two months after he claimed he cut off contact with the paedo.