Lifetime premieres trailer for Nicole Brown Simpson doc: Watch

Weeks after O.J. Simpson's death, his ex-wife Nicole Brown Simpson's murder is set to be explored in a new Lifetime documentary.

The network has premiered a trailer for its documentary about the murder of Brown Simpson, which features interviews with more than 50 participants, including members of her family. "The Life & Murder of Nicole Brown Simpson" will air in June.

"The one thing I could not protect her from was the monster she was married to," one of Brown Simpson's sisters says in the footage.

"What happened to our sister Nicole should never have happened to her or to any other woman," the Brown sisters said in a press release for the documentary. "Her life was stolen from her and while her abuser is finally gone, it doesn't take away the anguish we feel or the pain of her children who lost their mother. We hope that by sharing Nicole's story, it will help others recognize the signs and get the help they need and her legacy will continue to live on."

The trailer also features home videos of Brown Simpson and O.J. Simpson, who were married from 1985 to 1992, and includes interview subjects recounting that she "always thought he was going to hurt her." The documentary promises to delve more into who Brown Simpson was, with participants arguing that she "got lost in this whole thing" and was more than a "headline of a tragedy."

Lifetime to airdocumentary on Nicole Brown Simpson, O.J. Simpson's ex-wife who was killed

"For 30 years, one woman remained forgotten," the trailer says, "until now."

Brown Simpson and her friend Ronald Goldman were murdered at her home on June 12, 1994. She was 35. Simpson was later arrested and charged with the murders but found not guilty during the so-called "trial of the century" in 1995. In 1997, the former NFL star was found liable as part of a civil lawsuit and ordered to pay the families $33.5 million.

Simpson died last month at age 76 from cancer. That same day, Lifetime confirmed to USA TODAY that a documentary about Brown Simpson was on the way, with a spokesperson saying that it aimed to give her "her narrative back."

"The Life & Murder of Nicole Brown Simpson" comes on the heels of Lifetime's documentary "Where Is Wendy Williams?," which explored the declining health of the former talk show host. Williams publicly shared that she has dementia shortly before it aired, and Williams' temporary guardian unsuccessfully attempted to block the documentary's release.

Nicole Brown Simpson's sisters say her 'voice is finally being heard'

Brown Simpson's sisters spoke further about losing their sister and the issue of domestic violence at Variety's Power of Women event on Thursday.

"It's going to be 30 years since we lost our sister," Denise Brown said at the Lifetime-sponsored event. "And the work we do, because of the ... tragedy, will never end."

She continued: "I'm so proud that Nicole's voice is finally being heard."

Brown, who helped pass the Violence Against Women Act, later highlighted the "incredible pain" Brown Simpson endured from her "abuser," Simpson.

"Through that pain, she was able to protect her children she's able to be there for her children to walk away from her abuse," she said. "Nicole's legacy will inspire all of us to continue in our work, to continue with our efforts so that there is not another Nicole lost."

How to watch 'The Life & Murder of Nicole Brown Simpson'

"The Life & Murder of Nicole Brown Simpson" will air on Lifetime on June 1 and June 2 at 8 PM ET.

Contributing: Anika Reed, KiMi Robinson and Taijuan Moorman, USA TODAY; Reuters