WHITE PLAINS, N.Y. (CBS4) – The Florida woman accused of killing her husband and mother-in-law faces a new charge which carries a mandatory sentence of life in prison.

Federal prosecutors released a revised indictment Tuesday in the case against Narcy Novack, 54, of Fort Lauderdale, and her brother, Cristobal Veliz, 57, of Brooklyn.

READ MORE: Surfside Condo Collapse: At Least 1 Dead, 99 Unaccounted For; 55 Units Involved In Catastrophe

They are charged with hiring the killers of Bernice Novack, 87, in her Fort Lauderdale home, and Ben Novack Jr., 53, in his suburban New York hotel room. The slayings occurred three months apart in 2009.

Ben Novack was the son of the man who built the Fontainebleau hotel in Miami Beach. Prosecutors allege Narcy Novack wanted to get her hands on her husband’s multimillion-dollar estate.

The new indictment adds a charge of murder in aid of racketeering, alleging that the killings were part of an interstate plan to enrich the defendants.

The charge can be punishable by death in some cases, but prosecutors announced earlier they would not seek the execution of Novack and Veliz. So if the defendants are convicted on that charge, the mandatory sentence would be life in prison without hope of parole.

Under the previous indictment, life in prison would have been the maximum sentence but not mandatory.

READ MORE: Condo Collapse: FIU Professor Found Surfside Building Had Been Sinking For Decades

The new indictment also adds charges relating to the maiming of Ben Novack “by bludgeoning his head and body with dumbbells and slitting his eyes with a knife” as he was being killed at the Hilton hotel in Rye Brook, where his company had organized an Amway convention.

Prosecutors alleged earlier that Novack’s eyes were cut on his wife’s orders after she let two killers into the hotel room.

Calls to defense attorneys were not immediately returned Tuesday. Novack and Veliz pleaded not guilty to the earlier charges.

A court session on the new indictment is scheduled for Oct. 5.

If Narcy Novack is convicted, her daughter, May Abad, stands to inherit the Ben Novack estate, which includes one of the world’s largest collections of Batman memorabilia.

MORE NEWS: Condo Collapse: Despite Broken Pelvis After 4-Story Fall, Mom Pulls Daughter Out Of Rubble

(TM and © Copyright 2011 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2010 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)