Ex-Boyfriend of 'Yoga Twin' Speaks of Sisters' Violent Tempers: From 'Jekyll to Hyde'
Keith Weiss once dated Anastasia Duval, the woman allegedly killed by her twin sister, Alexandria.
There are new details in the troubled relationship between twin sisters that allegedly ended in murder.
Keith Weiss, who once dated slain sister Anastasia Duvall, told Inside Edition Wednesday that the twins often fought, and the altercations often turned physical.
Read: These Roommates Look So Alike Even Their Friends Get Them Confused
“I knew something was going to happen,” he said. “I knew it was just a matter of time – just never thought it would unfold like a made-for-TV kind of movie.”
Weiss said Anastasia called him one night, saying she was going to kill her sister. “I’m like, 'wait, what’s going on?' And she’s like 'Alexandria and I are fighting.'
"And all of a sudden I hear thump, thump, thump. And she’s like, 'That’s me. I’m hitting her with the phone.'"
Alexandria is charged with murdering her sister by intentionally plunging their car off a steep cliff in Maui. Anastasia died from her injuries, while Alexandria was critically hurt and has since recovered.
She is being held without bail in upstate New York, where she is awaiting extradition to Hawaii.
Witnesses to the crash said the women appeared to be arguing and hitting each other before their vehicle went over the side.
Read: It's a Twin-Twin Situation: Adorable YouTube Sisters Are Double the Cuteness
Alexandria's attorney, Kevin O'Brien, said the crash was a tragic accident.
Weiss said he had seen the sisters become violent towards each other before.
He was driving both sisters in a car when they asked him to pullover to buy wine. Weiss said he didn’t want to.
“Anastasia turned around and she started kicking my right hand on the wheel, like she was trying to knock me over into the other lane,” he said. Eventually, he managed to push her back into her seat, he said.
“Either one of them at any given second could go from just Jekyll to Hyde,” he said.
Watch: Mariah Carey's Twins and Beyonce's Ivy Blue Are Instant BFFs on First Playdate
Trending on Inside Edition

Store Manager Says 911 Operator Hung Up Because She Was Whispering as Buffalo Gunman Stalked Aisles
Crime
Police Searching for Person of Interest in Mysterious Shooting Deaths of New Hampshire Couple
Crime
Anita Hill, the Optimist: Overcoming the Undoing of Roe v. Wade Is Possible 'by Pulling Together,' Hill Says
Politics
TV Reporter Becomes Center of Online Conspiracy Theory Because of a Typo
Offbeat
Georgia SWAT Officer Gets Flagged Down on Road and Saves Baby Who Stopped Breathing
Heroes