robert durst was indicted wednesday on the two weapons charges that have kept him in new orleans .
grand jury charged durst with possession of a firearm by a felon , and possession of both a firearm and an illegal drug : 5 ounces of marijuana .
on thursday he appeared in court to plead not guilty .
durst , 71 , is wanted in california for the murder of his friend susan berman .
berman , an author who formerly acted a media spokeswoman for durst , was shot in the head at her benedict canyon home in 2000 .