The fire department first got the call at 12:38 p.m., and crews from 20 fire departments took more than four hours to finally bring the blaze under control.
Gramiccioni said that anyone who might have any information, no matter how small, regarding the fire, should contact the Monmouth County Prosecutor's Office of Colts Neck Police Department.
Three others were found dead inside the Colts Neck home, including his wife, Jennifer Caneiro, the report said. A firefighter was injured while battling the Colts Neck blaze.
A neighbor said they saw Paul and Susan at their home shortly after the fire broke out.
Authorities told NBC that there's no reason to believe the nearby community is in danger.
A sheet, seemingly covering Caneiro's body, could also be seen in the middle of the yard next to the house with police tape cordoning off the area.
Colts Neck is a wealthy community 50 miles south of NY, home to celebs including rock star Bruce Springsteen and U.S. comedian Jon Stewart.
The identities of the victims have not been made public, but public records show that the home is owned by Keith and Jennifer Caneiro. Public records seem to indicate that the Ocean Township home was owned by a relative of the Caneiros.
Monmouth County Prosecutor Christopher Gramiccioni said that the fire was intentionally set.
Caneiro is the founder and CEO of Holmdel, NJ-based tech company Square One, according to his LinkedIn page. His profile says he graduated from Columbia University with a Master of Science degree in 2018 and previously received certifications from Harvard Business School's online platform. That home, about 16km from Colts Neck, is owned by Paul and Susan Caneiro, and public records show the men are related, sharing at least one address in NY several decades ago.
The fire is suspected to be arson, but people in town are not at risk at this time, he said.
Caneiro is listed as the vice president of firm Square One. They are also "friends" on Facebook, but it is unclear how they are related.