'I killed them all,' eccentric scion says

An eccentric US real estate scion linked to two killings has been arrested in connection with a third murder, after being caught on an open microphone saying he "killed them all" during the taping of an HBO television documentary about him.

Robert Durst, the heir of a wealthy New York real estate family, was taken into custody on Saturday at a New Orleans hotel at the request of Los Angeles police officers investigating the 2000 killing of his friend Susan Berman. He was being held on a warrant for homicide, US media reports said.

The arrest came a day before the HBO television network broadcast the final episode of a six-part documentary series about Durst called The Jinx: The Life and Deaths of Robert Durst. He had agreed to lengthy interviews for the series.