Friends close to the woman accused of murdering her twin sister weigh in on the sisters’ complicated relationship

This June 2016 booking photo released by the Maui County Police Department shows Alexandria Duval. A woman who was driving a vehicle when it plunged off a Hana, Hawaii cliff is charged with second-degree murder in the death of her twin, who was in the passenger's seat. Prosecutors say Alexandria Duval, who is also known as Alison Dadow, intentionally caused the death of her identical twin sister, Anastasia Duval, also known as Ann Dadow. The incident took place on May 29, 2016. (Maui County Police Department via AP)

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After an SUV carrying two identical twins plunged off of a cliff in Hawaii, Alexandria Duval has been charged with intentionally killing her sister, Anastasia Duval. The 38-year-old is scheduled to stand trial on murder charges this fall, and authorities believe the incident was the result of a volatile sibling relationship.

According to friends close to the sisters, they were extremely close, but their relationship was tainted by failed businesses, debt and frequent moves. In fact, the two yoga instructors tended to get into explosive fights.

“I once got a call from [Anastasia] saying, ‘Get over here now … I’m going to kill her,'” Keith Weiss, a Florida chef who says he dated Anastasia, said. “She actually started hitting [Alexandria] with the phone. I heard it … thump, thump, thump. They were both screaming at each other.”

RELATED: A witness’s harrowing account of a woman driving her twin sister to her death is as tragic as it gets

“I get to their apartment and there’s broken glass everywhere from wine bottles and shattered glasses. There was blood everywhere, and the bedroom door was falling off its hinges,” he continued. “Both of them were sitting on the couch when I walked in, and they were like, ‘Hey … how are you doing?’ Alison had a bruise on her face. I asked them if they were okay, and they were like, ‘We’re good, we’re fine. We’re just watching a movie.’ Meanwhile, all around them, it’s total destruction. They seemed to not know they wanted to kill each other just minutes earlier.”

Weiss added that the twins began fighting while in his car at least twice, with each argument becoming “very intense” and nearly resulting in car accidents. He broke things off with Anastasia after the second occasion, horrified that the twins didn’t seem to care that their fight almost got all three of them killed.

Kimberly Keiser Henry went to high school with the Duvals and insists that they were “inseparable” and had an “amazing bond.” However, she noted that as teenagers, the twins were a bit reckless.

“They were sweet, sweet girls that just, unfortunately, made poor choices, and I think the stress of that had gotten to them,” she said. “I don’t know how she’s going to even continue or function without her sister. They had that type of bond.”

RELATED: Multiple women make shocking sex abuse allegations at a prison in Hawaii — one tried to kill herself

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