Alexandria and Anastasia Duval

A yoga instructor is charged with second degree murder after she drove off a cliff to deliberately kill her twin sister, police allege.

Honolulu police say Alexandria Duval, also known as Alison Dadow, intentionally drove her car off a cliff to kill her identical twin sister, Anastasia Duval, also known as Ann Dadow.

The 37-year-old twins were in a Ford Explorer traveling south on Hana Highway when they crashed into a rock wall.

Witnesses saw the two women arguing in the idling car, and the passenger pulling the driver’s hair.

“Then they saw the vehicle “accelerate forward and then take a sharp left over the cliff,” said Maui Deputy Prosecuting Attorney Emlyn Higa.

The car plunged 200 feet to the jagged rocks below and landed in a crumpled heap on its side.

ABC13 News reports the car’s air-bag control module showed that the driver did not take her foot off the gas or tap the brake as the car hit a wall and careened over the cliff.

Anastasia was pronounced dead at the scene. Alexandria was transported to a hospital in critical condition.

She was released from the hospital on Friday, and arrested at the Seaside Hotel the same day.

The prosecutor was concerned that she might flee the island to avoid prosecution.

“We had information after she was discharged from the hospital she attempted to fly out of the jurisdiction Wednesday night,” Higa said, adding that she made flight arrangements for Friday.

“All we know is she was trying to leave the state,” Higa said. “We were afraid she would try to leave the country as well.”

Alexandria, aka Alison, appeared in a courtroom with her arm in a sling. A judge ordered her held without bail.

“Alison did not try to harm herself or the person she most loved and was closest to in the world,” said her defense attorney, Todd Eddins.

It isn’t clear why or when the sisters changed their names.