NEW ORLEANS — On March 8, an HBO documentary revealed new evidence seeming to tie Robert A. Durst to the 2000 killing of his confidante Susan Berman. Not long after, Mr. Durst stopped using his cellphone.

On March 10, law enforcement authorities tracing the location of the phone noticed the signal moving east out of Houston, before it died completely. Having later traced Mr. Durst to a hotel in New Orleans, agents approached the front desk clerk and ran through 10 different aliases that Mr. Durst had once used. Nothing turned up.

Then they spotted him in the lobby.

These were just some of the revelations at a crowded hearing in Orleans Criminal District Court here on Monday, which ended with a judge ordering Mr. Durst, who has been charged in Los Angeles with the murder of Ms. Berman and with lesser charges here, to be held in jail in Louisiana without bail.

Prosecutors argued that Mr. Durst was a flight risk, presenting evidence that he was expecting to get over $100,000 in cash and saying that a map of Cuba had been found in his hotel room.