NEW ORLEANS- A federal prosecutor says the proposed sentence for New York real estate heir Robert Durst was worked out in "very intense negotiations." Assistant U.S. Attorney Michael McMahon calls the plea agreement "a good result."

Durst pleaded guilty Wednesday to a weapons charge and agreed to seven years and a month in prison.

However, Chief District Judge Kurt Englehardt says he won't put that plea into the record until he gets a pre-sentence report and decides whether to accept the agreement.

Defense attorney Richard DeGuerin says Durst just wants to get to California to prove he didn't kill Susan Berman. He's been charged with murder in her death.

McMahon says the murder case is "certainly not a slam-dunk" and will be fiercely fought, but he thinks Durst will be convicted.