Private investigator William Dear has penned a new book with the stunning allegation that Jason Simpson, not his father O.J., murdered Nicole Brown Simpson and Ron Goldman on June 12, 1994.

In O.J. Is Innocent And I Can Prove It, Dear says he's spent the last six years investigating the case.

OJ Simpson's slain ex-wife's nephew, Sean Brown, was arrested on Tuesday morning for alleged domestic violence against his live-in girlfriend, Amy Johnson, RadarOnline.com has learned.

According to the booking record, Sean was taken into custody in Orange County, Calif. and is being held on $50,000 bail.

"Police responded to a domestic violence call at about 2:30 a.m. and after an investigation was conducted both parties were taken into custody," Commander Stephen Colon of the Santa Ana Police Department told RadarOnline.com.

"Both parties sustained physical injury but neither required hospitalization."

Kris Jenner's blockbuster memoir, previewed exclusively on RadarOnline.com on Saturday, is shedding a dramatic new light on the murder of her best friend Nicole Brown Simpson.

Nicole, the ex-wife of football superstar-turned actor O.J. Simpson, was found brutally stabbed to death at her Los Angeles home approximately 10:50 pm on June 12, 1994.  Her friend Ron Goldman was also murdered.

Now Radar is revealing that Kris believes she could have saved Nicole had she met with her, as Nicole wanted, the very morning of her friend's murder.

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Nicole called her early on June 12th, Kris writes. "Nicole said, "Can you get over here...? I need to talk to you. It's really important'."

Busy with her own children, Kris asked if they could put it off until the next day. But Nicole was persistent. "'That's okay, can you meet me tomorrow for lunch? I really have to talk to you about something really, really important'." Says Kris, "It would be the last time I would ever speak to Nicole."

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The next morning, Kris was plunged into shock and trauma as she woke to the news that her close friend had been stabbed to death. "I instinctively knew that in some way O.J. had something to do with her death.

"I truly couldn't believe she had been so betrayed by the person who she had once loved most. That O.J. would be so destructive and selfish and jealous that he would do that to her was just mind-blowing to me. All these thoughts were running through my mind: This can't be true."

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Her sadness grew even deeper as she realized that changing her schedule to meet Nicole on the eve of her murder could have saved Nicole's life. A mutual friend later told her, Kris writes, that "Nicole had been beaten up by O.J. and she had been keeping this physical proof in the form of photographs and, it would turn out, other evidence, in which she had documented seventeen years of abuse. Nicole really wanted someone close to her to know what was going on, so that somebody - namely me - could be a witness."

Kris was devastated at missing the opportunity to possibly save her. She recalls screaming, "'Oh my God! It's too late! It's too late!'...The realization that she had wanted to confide in me hit me so hard. ... And I had let her down."

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O.J. stood trial for both Nicole and Ron's deaths, and was found not guilty.  In a civil case brought jointly by the Brown and Goldman families, he was found liable for their deaths, and ordered to pay $34 million in damages.  They only ever received a few thousand.

Simpson is now serving a 33-year sentence for kidnapping, assault with a deadly weapon and other felonies in connection with a bizarre incident in Las Vegas where he attempted to recover what he claimed was stolen sports memorabilia.

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Kris Jenner...and All Things Kardashian goes on sale November 1.

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Kris Jenner is known as the ultimate momager, the woman who catapulted her daughters Khloe, Kourtney, and Kim Kardashian to stratospheric fame.

But before that, Kris was famous as the ex-wife of O.J. Simpson "dream team" attorney Robert Kardashian and as one of Nicole Brown Simpson's best friends.

Now, for the first time, Kris is speaking about O.J.'s murder trial -- and secret evidence only she has known -- in her memoir, Kris Jenner...and All Things Kardashian.

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Only Radar has an exclusive look at her blistering attack on O.J., of whom Kris says, "I never believed O.J., not for one second."

The abusive Simpson marriage ended in divorce in 1992 but Nicole's fears about O.J. became worse after the split.  Kris writes that Nicole told her, 'He's going to kill me and he's going to get away with it.'

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"She was a wreck," Kris writes. "She was convinced that someone was looking in her windows and climbing through her bushes in the middle of the night. She became convinced that the person spying on her was either O.J. or someone sent by O.J., who was obsessed with what she was doing when he wasn't with her. She told me that she was being stalked, and she believed it was O.J."

When Kris -- along with the rest of the world -- learned on June 12, 1994, Nicole and her friend Ron Goldman had been murdered, Jenner writes, "I instinctively knew that in some way O.J. had something to do with her death."

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Kris was in limited contact with her ex-husband Robert during the trial -- they'd divorced in 1990 and she'd since married Bruce Jenner -- she found herself unwittingly enmeshed in the details of the case.

While driving in L.A. shortly after the murder, for example, she found herself stopped at a light next to Robert and O.J. When she called Robert to figure out what they were doing, just days after Nicole's horrible death, she recalls feeling very suspicious.

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"'O.J. was really upset because we had to go to the airport to get his [golf] clubs," [Robert explained]," when Kris called him with questions later that night, she writes. Incredulous, Kris asked why a grieving man would do such a thing, when the airport could just mail them to him. She continues, "'Well, Kris,' [Robert said, "]he was at a golf tournament,'"... referring to O.J.'s supposed whereabouts in Chicago the day after the murder. "'When the police came and took him to the airport and he got on the plane, his clubs didn't make it. They just arrived today.'"

"I thought that sounded suspicious," Kris admits.  So did many others, and the rumor arose that O.J. had hidden the murder weapon, a knife, among the metal clubs so it wouldn't set off security alarms.

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Even more suspicious, she writes, "According to Robert, that night or shortly thereafter, O.J. said that he wanted to go for a walk, and he needed to go by himself. He said he needed to go "talk to Nicole." So he went on this really long walk...I'll always wonder what O.J. did on that walk. Did he take the knife out of the golf bag and throw it into a canyon or in somebody's trash can? That still haunts me."

Furthermore, Kris claims she was with Nicole when she bought gloves very similar to the infamous leather version O.J. tried on during the trial, but when he put them on for the jury they were obviously shrunken from contact with a liquid. "It was such a ruse," she laments.

Kris was never called to testify about any of this information or about the domestic abuse Nicole suffered, and it seems she is relieved to finally tell Nicole's side of the story in her memoir.

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"We couldn't believe it. Not guilty!...," Kris writes, "'Wow, there is no justice for her,' I thought....We were all so devastated."

But ultimately, Kris knew O.J. would fall victim to another form of retribution. "I knew that, on some level, he would suffer for what I felt he did," Kris confesses. "I took some solace in that."

Simpson was later found liable in the deaths of Nicole and Ron Goldman in a civil lawsuit brought by their families. He was ordered to pay them millions but they saw only a few thousand dollars.

It was ironically a case involving his own sports memorabilia that finally put OJ behind bars.

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O.J. is now in the Lovelock Correctional Center near Las Vegas. On December 5, 2008, he was sentenced to 33 years for several felony convictions including kidnapping, criminal conspiracy and assault with a deadly weapon.

Robert Kardashian admitted in a 1996 interview that he had "doubts" about his friend's innocence. He died in 2003 without ever revealing more than that.

Jenner's memoir hits bookstores November 1.

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Casey Anthony's 'not guilty' murder verdict has stunned the world and now as she walks free on charges of killing her 2-year-old daughter, Caylee, RadarOnline.com is bringing you America's most shocking court case finales.

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OJ Simpson
In perhaps one of the most controversial court battles of all time, the former professional football player was acquitted of murdering his ex-wife Nicole Brown Simpson and her friend Ronald Goldman in 1995.