The HBO documentary on Durst, called "The Jinx," doesn't give an accounting of his current wealth. Yet reports suggest that he's not a billionaire, he's not a real estate baron and while he is a scion, he's been essentially cut out of the family fortune.
Read MoreA $60,000 speeding ticket!
The Durst family's real estate empire is worth more than $4 billion, according to the 2014 Forbes list. The family business started in 1915, when Joseph Durst, Robert's grandfather, an Austrian-Jewish immigrant, bought a building on 34th Street in New York that year. Joseph's son Seymour expanded the business to bigger skyscrapers in midtown and downtown. The family's projects now include the Bank of America Tower near Bryant Park, the Conde Nast building in midtown and a partnership in the World Trade Center.
Yet in 1994, Seymour Durst made his younger son, Douglas, the head of the family business. Robert Durst left the business, but later waged a legal battle against the family to remove the family's trustees for a larger share of the trusts and fortune. During that time, he reportedly received more than $2 million a year from the family trusts.
Read MoreHere's 2014's best collectible investment....
In 2006, he reached a settlement, with the family agreeing to pay him around $60 million to $65 million, according to report from The New York Times and other media.