"Born into a real estate dynasty that ranked with the Trumps, Zeckendorfs and Helmsleys in New York, Mr. Durst had been a deeply troubled outlier of the family since his youth."

"He fought constantly with his younger brother Douglas, who went on to head the family empire. When Robert Durst tried joining the button-down real estate world, he failed miserably. He was socially awkward, muttered to himself, belched noisily in public and urinated in office wastebaskets. In other settings, he could be smooth, urbane and enormously generous. He gave thousands of dollars to friends, attended the ballet and partied at Studio 54 and other Manhattan hot spots. A master of disguises and aliases, he maintained a stash of wigs and masks and assumed false identities.... In the final episode of the six-part HBO series, he is heard muttering to himself during a bathroom break, apparently unaware that a microphone attached to his clothing is still live: 'What the hell did I do? Killed them all, of course.'"

From "Robert Durst, heir to New York real estate fortune and convicted murderer, dies at 78" (WaPo).