The HBO documentary series is a groundbreaking six-part investigation into the life of New York real estate heir Robert Durst, who was long suspected of involvement in three notorious crimes: the 1982 disappearance of his first wife, Kathleen McCormack; the 2000 execution-style murder of his friend Susan Berman; and the 2001 killing and dismemberment of his neighbor Morris Black. Directed by Andrew Jarecki, the series is famous for its shocking finale, where Durst was caught on a hot microphone seemingly admitting to the killings by muttering, "Killed them all, of course". The Three Main Cases

The documentary meticulously covers decades of legal evasion and mystery surrounding Durst:

Durst's first wife disappeared in New York. While investigators long suspected him due to their volatile relationship and reported history of abuse, her body was never found, and Durst was not charged for decades.

A close friend and confidante of Durst, Berman was found murdered in her Los Angeles home just as New York authorities were reopening the investigation into Kathleen's disappearance.