The defense blamed tunnel vision, but jurors convicted on murder and arson counts.
COLTS NECK, N.J. — A jury in Monmouth County convicted Paul Caneiro on Friday of murdering his brother’s family in 2018 and setting fires at two homes that prosecutors said were designed to hide the killings and confuse investigators.
The verdict closes the trial phase of a case that began with flames at a Colts Neck mansion and another blaze miles away at the defendant’s home. Prosecutors said the killings were driven by financial conflict after a business partnership between brothers collapsed. Caneiro, 59, was convicted of four counts of murder, two counts of aggravated arson and weapons charges. The judge scheduled sentencing for May 12, when Caneiro faces a potential life sentence and lawyers are expected to argue over punishment.
Investigators traced the case back to Nov. 20, 2018, when emergency crews rushed to fires at two properties tied to the Caneiro family. At the Colts Neck residence, responders encountered a large house burning and found Keith Caneiro, 50, outside, dead from multiple gunshot wounds. Inside, authorities determined that Jennifer Caneiro, 45, had been stabbed and shot. The couple’s children, Jesse, 11, and Sophia, 8, were found dead from stab wounds, officials said. Around the same time, crews responded to a fire at Paul Caneiro’s home in Ocean Township. His wife and children escaped safely, and prosecutors later said the second fire was not a separate crime but part of an effort to stage the scene and delay clarity about what happened inside the Colts Neck house.
At trial, prosecutors framed the attacks as a planned assault carried out while the victims slept. They said the defendant moved through the house in the middle of the night, killed the adults and children, and then set fires meant to destroy evidence and make the deaths look like the result of a broader threat. The state tied the motive to money and control, telling jurors that Keith Caneiro uncovered theft from shared business ventures and from him personally. The brothers jointly ran a computer systems company and a pest control business, prosecutors said, and the relationship deteriorated as questions about finances grew sharper. Prosecutors also pointed to the pattern of the two fires as part of a cover story, not coincidence.
The defense urged jurors to distrust that narrative and argued investigators missed alternative explanations. Defense attorney Monika Mastellone told the jury that her client did not kill anyone and said the state built its case by narrowing its focus too early. She described the brothers as close and said Paul Caneiro would not hurt the children. In court, she said the brothers “deeply loved each other and were best friends,” and she said his niece and nephew were children he “cherished and adored.” Mastellone also argued that detectives failed to fully investigate other people who might have had a reason to harm Keith Caneiro, including another brother. She said authorities did not take that man’s DNA and did not treat him as a serious lead, though she argued he could have benefited financially. That brother denied involvement.
Prosecutors answered the defense by pointing to the timeline and to what they described as concrete links between Keith Caneiro and the defendant in the days before the killings. They highlighted a call Keith Caneiro made the day before he and his family died, when prosecutors said he demanded information about a life insurance trust account. They argued that the contact underscored that Keith Caneiro was pressing Paul Caneiro for answers and that tension was rising. Prosecutors also rejected the defense suggestion that two people seen near the Colts Neck house shortly before responders arrived were suspicious. They said the men were first responders and argued that neighbor reports about when the men appeared did not match the confirmed dispatch times. The jury deliberated for about five hours before returning guilty verdicts across the core charges.
The path to trial took years, and the long delay became part of the story around the courthouse. Proceedings were postponed during the coronavirus pandemic and later slowed again by legal disputes over what evidence could be presented to jurors. Lawyers fought over key material, and some arguments reached New Jersey’s highest court before the case returned for a full trial. When testimony finally concluded, the trial centered on whether prosecutors proved a single killer who staged two fire scenes or whether the investigation left open a different perpetrator. Friday’s verdict signaled that jurors accepted the state’s account of the motive, the sequence of violence and the reason for the fires.
For Colts Neck and nearby communities, the case had remained a grim marker since 2018 because it involved a family with two young children and a dramatic emergency response. Early public attention focused on the Colts Neck house fire, but investigators quickly treated it as more than an accident after bodies were discovered and evidence pointed to violence. Prosecutors later described the second fire at Paul Caneiro’s home as a key part of the alleged cover, because his family’s escape could make it appear that the household was also under attack. The guilty verdict now shifts attention to sentencing, where the court will weigh multiple murder convictions and arson counts that prosecutors said were meant to conceal the crimes.
On May 12, the judge is expected to hear arguments about the length and structure of the sentence and any statements from relatives or other affected people. Caneiro remains convicted of four murders tied to the 2018 deaths of Keith and Jennifer Caneiro and their children, along with aggravated arson charges tied to fires at both homes. As of Sunday, the conviction stands, and the next scheduled step is the sentencing hearing in Monmouth County.
Author note: Last updated February 15, 2026.