Paul Caneiro's wife and daughters escaped unharmed in the Ocean Township blaze.
The details of the heinous crime spree came just hours after Monmouth County prosecutors filed murder charges against Paul Caneiro in the November 20 eruption of violence in Colts Neck and Ocean Township, New Jersey.
The Monmouth County Prosecutor's Office has indicated it will give new details in the quadruple homicide Thursday.
Paul Caneiro then set a fire in the basement of the sprawling home that smoldered for several hours before erupting into an inferno, Gramiccioni said.
Paul Caneiro has been in custody since authorities accused him of setting fire to his Ocean Township home on November 20, hours before flames were discovered at the Colts Neck mansion where Keith Caneiro and his family lived.
On that date, Keith and Jennifer Caneiro and their children, Jesse, 11, and Sophia, 8, were killed and their Colts Neck mansion purposefully set on fire, authorities have said.
While it took more than a day after the murders for the burned-out $1.5 million Colts Neck mansion to be deemed safe to enter by county engineers, Gramiccioni said investigators have recovered a great deal of evidence since then from the crime scene, which ultimately resulted in the charges against Caneiro. As a locally owned news organization, TAPinto through its advertisers is able to publish online, objective news 24/7 at no charge. Prosecutors had previously reported that Keith Caneiro was shot.More news: Clooney's set to become Prince Harry, Meghan's first-born child's godparents?
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Paul Caneiro, a 51-year-old from Ocean Township, New Jersey, has been charged with four counts of murder, one count of firearm possession, one count of knife possession, and one count of aggravated arson after he allegedly killed his 50-year-old brother Keith Caneiro, his wife Jennifer Caneiro, and their two young children.
Paul Caneiro is charged with setting fire to his home Tuesday in Ocean Township. Their bodies were found severely burned, and a medical examiner is still investigating the cause of death, Gramiccioni said.
"That fire was a ruse to make it appear as if the overall Caneiro family was somehow targeted", Gramiccioni said.
Attorney Robert A. Honecker had previously maintained his client was innocent and said Caneiro was "devastated by the news of his brother and his family's deaths".
Paul Caneiro was charged last week with aggravated arson stemming from the fire at his house.
Keith and Paul Caneiro were partners at a technology firm in Asbury Park called Square One. "Have no reason to believe that's the case, think it was targeted".
The prosecutor's office has not discussed a possible motive in the crime.