As for a motive for the murders, Gramiccioni said it appears to be related to financial issues stemming from the brothers' joint business ventures.
Paul Caneiro was also charged with aggravated arson, possession of a firearm and possession of a weapon for unlawful goal, according to court records.
According to defense lawyer Rob Honecker in a Saturday report from Patch, Paul Caneiro's family insisted that he was the one who saved them from the fire at the Ocean Township home.
The prosecutor said the fire at Paul Caneiro's house was set to destroy evidence he had brought there from the crime scene, but also had another goal.
During the early morning of November 20, Caneiro is alleged to have repeatedly shot and kill brother Keith, 50, outside Keith's Colts Neck estate at 15 Willow Brook Road, and then he moved inside the home to murder the rest of his family, according to the Monmouth County Prosecutor Christopher Gramiccioni, who detailed the charges at a November 29 press conference.
Jennifer and Keith Caneiro were found dead at their Colts Neck mansion.
Prosecutors say financial motives led a technology executive in the U.S. state of New Jersey to kill his brother, the brother's wife and their young children before setting fire to their two homes.
He has not entered a plea on the new charges, the records show.
Settling Kashmir needs Capable Leadership, says imran Khan
The village was settled by Baba Guru Nanak in 1521 and is famous for its white-domed Gurdwara Kartarpur Darbar Sahib. If France and Germany can forget historic enimosity and become friends, then cannot India and Pakistan, he said.
Tributes are hung on a fence in front of the house that was the site of a quadruple homicide in Colts Neck, N.J., Thursday, Nov. 29, 2018.
Paul Caneiro, 51, was charged with four counts of murder as well as arson and two weapons violations in the deaths of his 50-year-old brother, Keith, along with Keith's wife, Jennifer, and their two children.
Keith Caneiro had been shot while the other three had been stabbed to death. Medical examiners had not determined causes of death for them as of midweek.
Paul Caneiro's attorneys, Robert Honecker and Mitchell Ansell, said in a statement Thursday their client maintained his innocence and that his family "means more to him than anything else in this world".
While Paul Caneiro's wife, Susan, was home at the time of the Ocean Township fires, she was uninjured, officials said. He said the fire was started in two exterior locations at each end of the house.
The Monmouth County Prosecutor's Office had no comment. The area is still fenced off. Friends and loved ones of the Caneiro family have placed signs, photographs and flowers at the site as a memorial to the family.
Keith Caneiro was the CEO of tech company Square One in Asbury Park and Paul Caneiro was listed as the vice president of the company. "Have no reason to believe that's the case, think it was targeted".