Nicole Brown Simpson’s Final Years Revealed: Found ‘Freedom,’ Joy, Dated and Embraced Life After O.J. Divorce (Exclusive)

“What no one knows she experienced before her death is freedom,” Dominique Brown, 59, tells PEOPLE in this week's issue

Ahead of the 30th anniversary of her murder, Nicole Brown Simpson’s sisters are sharing exclusive details about her final years.

Nicole, 35, was found brutally stabbed to death along with her friend Ron Goldman, 25, in the courtyard of her Brentwood, Los Angeles, townhome on June 12, 1994. Her ex-husband and former NFL star O.J. Simpson had been accused of the killings before ultimately being acquitted in what was dubbed the "The Trial of the Century” in 1995. Though he was later found liable for the deaths at a civil trial, he maintained his innocence until his death from cancer on April 10 at the age of 76.

Nicole filed for divorce against O.J. — with whom she shared daughter Sydney, now 38, and son Justin, now 35 — in 1992, following a seven-year marriage filled with verbal and physical abuse. Looking back, her sisters say they are grateful to remember the brief period of joy and independence she enjoyed after her split.

Related: How Nicole Brown Simpson's Mother Told Her Children, then 8 and 5, She Was Dead: 'Mommy’s in Heaven' (Exclusive)

“What no one knows she experienced before her death is freedom,” Dominique Brown, 59, tells PEOPLE in this week’s cover story. “There was this levity about her. She was glowing.”

Tanya Brown, 54, adds, “I’m so glad that she had a good time the last two years of her life. I can’t bring her back, so why not try to look at it like that?”

Following the separation, Denise Brown, 66, says her sister Nicole “became the girl that she should have been at 18 years old.”

“When you're 18, you're having fun,” she says. “You go out with your friends and you dance and you have a good time.” Denise continues, “I think she went back to being 18."

Nicole also dated after the breakup. “I don't know how long the relationship lasted, but I know that she did date and she was happy,” Dominique tells PEOPLE. “I think she went on some trips and things, but as far as telling us she was in love or…”

“Anything, I never heard it,” Denise chimes in. “She never said it again. Yeah, she was having a good time.”

For more on the life of Nicole Brown Simpson, as shared by her three sisters, subscribe now to PEOPLE, or pick up this week's issue, on newsstands Friday.

In an upcoming Lifetime documentary series titled The Life & Murder of Nicole Brown Simpson, Nicole’s sisters are among 50 people who were interviewed. The series features new details about her life and death as well as never-before-seen footage of her, and will air over two nights on June 1 and June 2.

Related: Nicole Brown Simpson’s Sisters Break Their Silence Over O.J.’s Death: 'It’s Very Complicated' (Exclusive)

Denise also tells PEOPLE why she and her sisters felt that now is the right time to share Nicole’s story.

“Other anniversaries just didn’t feel right," she says. "But we decided 30 years was probably the best and the last time to hear her voice and tell her story.”

Tanya adds, “She’s not a dead body covered with a white sheet at the bottom of the stairs. That’s not Nicole. We want people to see this beautiful human being.”

If you are experiencing domestic violence, call the National Domestic Violence Hotline at 1-800-799-7233, or go to thehotline.org. All calls are toll-free and confidential. The hotline is available 24/7 in more than 170 languages.

The Life & Murder of Nicole Brown Simpson airs over two nights on June 1 and June 2 on Lifetime.

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