(CNN) -- Narcy Novack, who had been charged in the death of her millionaire husband, has now also been charged with conspiring in the death of his 87-year-old mother.
Novack, 54, and her brother, Cristobal Veliz, 57, are suspected of organizing the murder of Ben Novack Jr.'s mother, Bernice, in April 2009, according to a federal indictment unsealed Tuesday.
Her death was first identified as an accident, but was later characterized as a potential homicide.
Prosecutors allege the pair organized "co-conspirators" to attack the elderly woman in her home, the indictment said.
The charges add to an earlier charge that claims Narcy Novack was involved in the death of her husband, Ben Novack Jr., in July 2009.
Narcy Novack's attorney, Howard Tanner, said he wasn't surprised by the new indictment.
"It doesn't change the fact that Narcy Novack had nothing to do with the death of Ben Novack or the death of Bernice Novack," he said.
Veliz's attorney could not be immediately reached for comment.
Ben Novack Jr. -- heir to the famed Fontainebleau hotel in Miami Beach, Florida -- was killed in a Hilton hotel in Rye Brook, New York, the indictment said.