New details in the mysterious New Jersey quadruple homicide and mansion fire

The family of suspect Paul Caneiro has pledged to fully support him during the investigation.
2:10 | 11/25/18

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Transcript for New details in the mysterious New Jersey quadruple homicide and mansion fire
A family found dead after a fire in their mansion. The brother of the man who owned that home has come under suspicion. He's now getting vocal support. ABC's daft Wright joins us with those details. It's a grisly murder mystery in a New Jersey neighborhood, a businessman accused of dousing his own home in gasoline and setting it on fire, the same day his brother's family was found dead in a second fire nearby. This morning, the man accused of torching his own home with his wife and daughters inside is getting ready to appear in court. Authorities in New Jersey are charging Paul caneiro with arson. ABC news learned his wife and kids are willing to testify in his defense. Investigators continue to look into a possible link between that fire last Tuesday and the one at this mansion in nearby colts neck the same day. The million dollar home engulfed in flames. Authorities say they found Paul caneiro's brother and business partner Keith caneiro shot outside and his wife and children killed inside. This is one of most heinous cases we've ever seen. Reporter: That homicide still under investigation. Each of this individuals were the victim of homicidal violence at some point prior to when the fire was set. Reporter: Authorities not calling Paul caneiro a suspect in the murders. This morning his attorney tells ABC news his wife and daughters fully support him as he faces arson charges. This go fund me page set up for his two daughters maintains the family lost everything in the fire in their home. For now caneiro is charged with the aggravated arson at the fire at his home. Authorities neither confirm nor deny he may be a suspect in the other fire at his brother's home. His lawyers insist he's innocent. He's due in court on Wednesday. No winners here. Terrible story. David, thank you. We want to transition. I want to show you some video.

This transcript has been automatically generated and may not be 100% accurate.

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