UPDATE: Colts Neck fatal fire mystery deepens as brother is charged with setting his own house ablaze 
 
 Keith Caneiro grew up in Brooklyn and was the best man in his brother's wedding. 
 
 Caneiro, whom a source says was found dead outside his Colts Neck mansion on Tuesday, was the owner of a technology firm and a pest control company in Asbury Park, according to public records and social media. He also dabbled in real estate. 
 
 Caneiro, 50, his wife Jennifer Caneiro, 45, and two of their children died in an apparent quadruple homicide at the family's sprawling estate on Willow Brook Road, discovered after a fire swept through the home, a law enforcement source told NJ Advance Media 
 
 The source said that Keith Caneiro, who was found on the home's front lawn, had suffered a gunshot wound that did not appear to be self-inflicted. 
 
 Keith Caneiro is listed as the owner of both the technology firm, Square One, and EcoStar Pest Management in Asbury Park, working both businesses with his brother. 
 
 He had operated Square One, in Asbury Park since 1987, according to his LinkedIn profile. 
 
 Records show Caneiro also has an active real estate license. A professional real estate website registered with his name as the web address advertises an affiliation with Keller Williams Realty. 
 
 Jennifer Caneiro grew up on Staten Island as Jennifer Karidis, her maiden name, records show. 
 
 Photos of the Caneiros on Facebook show a happy family playing in the kitchen, relaxing with loved ones and enjoying trips overseas. 
 
 Caneiro's brother, Paul Caneiro, of Ocean Township, is involved in both the technology firm and the pest control operation, according to Jared DeVincenzo, who works in the building which houses both businesses. The pair grew up in Brooklyn before both marrying women from Staten Island and moving to New Jersey. 
 
 Paul Caneiro's home on Tilton Drive was also the scene of a fire Tuesday morning, one that is now also under investigation by the prosecutor's office for possible links to the Colts Neck fire. 
 
 Whether the two fires are related "remains to be seen," Gramiccioni told reporters. 
 
 Neighbors told NJ Advance Media Paul Caneiro appeared visibly distressed, with "tears in his eyes," after the fire broke out before dawn at his house. 
 
 Neighbors said he stayed at the scene until about noon. He and his wife had not returned home as of Tuesday evening. 
 
 Neighbors described the Ocean Township couple, who have two older children, as friendly and helpful, and said Paul Caneiro had been injured in a car accident in Asbury Park a few years ago. 
 
 When Paul Caneiro married his wife Susan in 1991, his brother Keith served as his best man, in a wedding officiated by the mayor of Shrewsbury, according to the couple's wedding announcement in the Staten Island Advance. 
 
 Keith Caneiro's LinkedIn profile says he graduated from Columbia University with a bachelor's degree in 2014, and was either enrolled or recently completed a master's program at the university. 
 
 Both his LinkedIn profile and Facebook page also indicate he had taken courses at Harvard Business School. 
 
 He graduated from John Dewey High School in Gravesend, Brooklyn. 
 
 Caneiro purchased the family's home on Willow Brook Road in 1999, according to Monmouth County property records. He and his wife paid off the $1.8 million mortgage two years ago. 
 
 Prosecutor's office officials indicate they expect to release more information Wednesday. 
 
 Sophie Nieto-Munoz contributed to this report. 
 
 Thomas Moriarty may be reached at tmoriarty@njadvancemedia.com. Follow him on Twitter at @ThomasDMoriarty. Find NJ.com on Facebook. 
 
 Have a tip? Tell us. nj.com/tips ||||| A man killed his brother's entire family and set both their house and his own home ablaze to make it appear both brothers and their families were targeted by someone else, the Monmouth County prosecutor said Thursday. 
 
 At a press conference, formally announcing four counts of first-degree murder against Paul Caneiro, 51, Monmouth County Prosecutor Christopher Gramiccioni said the motive for the killings appeared to be "financial in nature." The charges were earlier presented on NJ.com. 
 
 Caneiro, of Ocean Township, now stands accused of fatally shooting Keith Caneiro, 50, multiple times, then killing Jennifer Caneiro, 45, and the couple's two children, 8-year-old Sophia and 11-year-old Jesse. He is also charged with weapons offenses. 
 
 "We allege that Jennifer was shot and stabbed, and the two Caneiro children were repeatedly stabbed by knife," Gramiccioni told reporters at his office Thursday. 
 
 Gramiccioni declined to elaborate as to why investigators believe Paul Caneiro carried out the slayings, but said the motive may be related to businesses the brothers operated in Asbury Park. 
 
 A technology business ran by the brothers, Square One, had been struggling financially to stay afloat, according to a law enforcement source. 
 
 Furthermore, a former Columbia University classmate of Keith Caneiro told NJ Advance Media that Caneiro was actively seeking to walk away from Square One. The classmate, who did not want to be named, said Caneiro had recently sent him his resume and indicated he was willing to relocate to California for a new opportunity. 
 
 The brothers also owned a pest control business out of the same Asbury Park office. 
 
 Gramiccioni said his office has launched a financial investigation into the businesses. 
 
 "We recovered a great deal of evidence, and that evidence is being analyzed as we speak here today," the prosecutor said, cautioning he couldn't comment on the quality or strength of that evidence. 
 
 Caneiro, who has remained in the Monmouth County jail since he was arrested on Nov. 21 for allegedly setting fire to his own house, is scheduled to have his first court appearance on Friday. 
 
 On Thursday, his attorneys, Robert A. Honecker Jr. and Michell J. Ansell, issued a statement that said, in part, Paul Caneiro "had absolutely nothing to do with these horrific crimes." 
 
 "Paul's family means more to him than anything else in the world," the statement continued. "Paul's brother Keith and his family similarly were everything to Paul. He worked with his brother Keith for 31 years and he loved his sister-in-law as if she was his sister. Paul Caneiro always participated in the lives of Jesse and Sophia from watching them at their various events at school and spending time with them frequently. Paul Caneiro just couldn't say no to his family. 
 
 There is absolutely no reason in the world for Paul Caneiro to have committed the crimes he is alleged to have committed," it continued. 
 
 Authorities first responded to a fire on Willow Brook Road in Colts Neck around 12:30 on Nov. 20. It's there they discovered a blaze tearing through a massive mansion and Caneiro's body on the front lawn with gunshot wounds. 
 
 Once the fire was contained, authorities made an even grislier discovery inside: the bodies of Caneiro's wife, Jennifer, and their two young children. 
 
 In a bizarre twist, Gramiccioni said later that day that authorities had responded to a house fire in Ocean Township earlier that morning around 5 a.m. That home, on Tilton Drive, was owned by Paul Caneiro and his wife, Susan. 
 
 The next day, Paul Caneiro was charged with one count of aggravated arson after police said he set fire to his home with gasoline while his wife and two daughters were inside the house. 
 
 Further investigation, the prosecutor said Thursday, indicated Caneiro set his own home ablaze only after killing his brother and his brother's family and starting a fire in the basement of the Colts Neck mansion in the early morning hours. 
 
 Gramiccioni said Paul Caneiro apparently set fire to his own residence both as an attempt to destroy evidence he had brought back from Colts Neck, and as "a ruse" to make it appear the whole Caneiro family had been targeted. 
 
 The brothers were originally from Brooklyn and moved down to Monmouth County where they ran the tech business and the pest company, EcoStar Pest Management, out of the same Asbury Park office on Cookman Avenue. 
 
 Keith was the best man at Paul's wedding in 1991, according to a wedding announcement in the Staten Island Advance. 
 
 Funeral services for the Caneiro family are planned for Sunday at Holmdel Funeral Home. The Caneiro children who died attended the Conover Road School in Colts Neck. 
 
 Jesse was in fifth grade and also played baseball for the town team, the family obituaries say. Sophia was a cheerleader and Girl Scout in the third grade. 
 
 The killings have rocked the wealthy, tight-knit community of Colts Neck, a rural Monmouth County suburb near the Jersey Shore that's known for is sprawling horse farms and million-dollar properties. 
 
 "I'd be lying if I stood here and told you this was easy," Colts Neck Mayor J.P. Bartolomeo said at a candlelight vigil last week. "We lost four really nice people from our community, who I happened to be friends with, who my boys were friends with." 
 
 Gramiccioni said this is the "most brutal" crime he's seen since he took the top law enforcement position in Monmouth County in 2012. Gramiccioni said he would seek the death penalty if it was possible. 
 
 "I only enforce the law, I don't make it," Gramiccioni explained. "But if that was a possible sentence in the state of New Jersey, I would have certified this case as a Capital (Punishment) case." 
 
 Thomas Moriarty and Joe Brandt contributed to this report. 
 
 Alex Napoliello may be reached at anapoliello@njadvancemedia.com. Follow him on Twitter @alexnapoNJ. Find NJ.com on Facebook. 
 
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– A convoluted story out of New Jersey, where police have charged Paul Caneiro with aggravated arson in connection with a fire at his own home—one that the Asbury Park Press reports occurred seven hours before a fatal fire at his brother's mansion. Around 5am Tuesday, firefighters responded to Paul Caneiro's Ocean Township home and put out flames on the roof. Around 12:30pm, fire broke out at brother Keith Caneiro's home 12 miles away in Colts Neck, where police say a quadruple homicide occurred: Keith Caneiro, 50—found on the front lawn with a gunshot wound that didn't appear to be self-inflicted, per NJ.com—died along with his wife, 45-year-old Jennifer Caneiro, and their son and daughter, who were found inside, a law enforcement source tells the Asbury Park Press. The New York Times describes both children as under the age of 10. The brothers appear to have been close. Born in Brooklyn, they shared a Staten Island address for more than a decade before moving to New Jersey with their wives, per NJ.com. They would take up separate abodes: Paul in a single-family home on Tilton Drive in suburban Ocean Township, Keith in a $1.5 million mansion in upscale Colts Neck, home to celebrities like Bruce Springsteen. But Paul would still work for Keith— owner of EcoStar Pest Management and apparent web development company Square One—who also served as his best man. "They're wonderful people," says a neighbor of Paul, who saw family members Tuesday outside the house believed to have suffered damage to its back and attic, per the Times. "It's pretty shocking stuff." An earlier version of this story erroneously reported Paul Caneiro as being charged in the Colts Neck fire. (More on the case here.)