Identical twin sisters Alexandria and Anastasia Duval always lived together, played together and worked together, operating what were once two of the hottest yoga studios in the Palm Beach, Florida, area.

They would finish each other's sentences, and while they had boyfriends, their relationship seemed to come first.

But after a reality TV project fell through, the two descended into a cross-country spiral of business failures, debts, arguments and drunken run-ins with the law that all came to a tragic end last week.

That was when their SUV plunged off a 200-foot cliff in Hawaii during what was described as a hair-pulling fight over the steering wheel.

Anastasia, 37, was killed, and Alexandria was arrested and jailed on second-degree murder charges, accused of deliberately causing her sister's death.

Her lawyer says it's not true.